diff --git a/foundations/server/packages/middleware/src/guestPermissions.ts b/foundations/server/packages/middleware/src/guestPermissions.ts
index 077d546a84d..b6a7ba289ea 100644
--- a/foundations/server/packages/middleware/src/guestPermissions.ts
+++ b/foundations/server/packages/middleware/src/guestPermissions.ts
@@ -24,7 +24,7 @@ import core, {
   type TxUpdateDoc
 } from '@hcengineering/core'
 import platform, { PlatformError, Severity, Status } from '@hcengineering/platform'
-import contact, { type Person } from '@hcengineering/contact'
+import contact, { type Channel, type Person } from '@hcengineering/contact'
 
 /** Cached state loaded from GuestPermissionsSettings configuration document. */
 interface GuestPermissionsCache {
@@ -122,6 +122,11 @@ export class GuestPermissionsMiddleware extends BaseMiddleware implements Middle
   async tx (ctx: MeasureContext<SessionData>, txes: Tx[]): Promise<TxMiddlewareResult> {
     const account = ctx.contextData.account
     if (hasAccountRole(account, AccountRole.User)) {
+      if (!hasAccountRole(account, AccountRole.Maintainer)) {
+        for (const tx of txes) {
+          await this.processUserTx(ctx, tx)
+        }
+      }
       this.invalidateCacheIfNeeded(txes)
       return await this.provideTx(ctx, txes)
     }
@@ -160,6 +165,72 @@ export class GuestPermissionsMiddleware extends BaseMiddleware implements Middle
     }
   }
 
+  private async processUserTx (ctx: MeasureContext<SessionData>, tx: Tx): Promise<void> {
+    if (tx._class === core.class.TxApplyIf) {
+      const applyTx = tx as TxApplyIf
+      for (const t of applyTx.txes) {
+        await this.processUserTx(ctx, t)
+      }
+      return
+    }
+
+    if (!TxProcessor.isExtendsCUD(tx._class)) return
+
+    const { account } = ctx.contextData
+    if (await this.isForbiddenUserContactTx(ctx, tx as TxCUD<Doc>, account)) {
+      throw new PlatformError(new Status(Severity.ERROR, platform.status.Forbidden, {}))
+    }
+  }
+
+  private canUserEditPersonContactDetails (person: Person, account: Account): boolean {
+    if (person.personUuid === account.uuid) return true
+    return !this.context.hierarchy.hasMixin(person, contact.mixin.Employee)
+  }
+
+  private async isForbiddenUserContactTx (
+    ctx: MeasureContext<SessionData>,
+    tx: TxCUD<Doc>,
+    account: Account
+  ): Promise<boolean> {
+    const h = this.context.hierarchy
+
+    if (h.isDerived(tx.objectClass, contact.class.Person)) {
+      if (tx._class === core.class.TxCreateDoc) return false
+
+      const persons = await this.findAll(ctx, contact.class.Person, { _id: tx.objectId as Ref<Person> }, { limit: 1 })
+      const person = persons[0]
+      return person === undefined || !this.canUserEditPersonContactDetails(person, account)
+    }
+
+    if (h.isDerived(tx.objectClass, contact.class.Channel)) {
+      const parentPersonId = await this.getChannelParentPersonId(ctx, tx)
+      if (parentPersonId === undefined) return false
+
+      const persons = await this.findAll(ctx, contact.class.Person, { _id: parentPersonId }, { limit: 1 })
+      const person = persons[0]
+      return person === undefined || !this.canUserEditPersonContactDetails(person, account)
+    }
+
+    return false
+  }
+
+  private async getChannelParentPersonId (
+    ctx: MeasureContext<SessionData>,
+    tx: TxCUD<Doc>
+  ): Promise<Ref<Person> | undefined> {
+    if (tx.attachedToClass === contact.class.Person && tx.attachedTo !== undefined) {
+      return tx.attachedTo as Ref<Person>
+    }
+
+    if (tx._class === core.class.TxCreateDoc) return undefined
+
+    const channels = await this.findAll(ctx, contact.class.Channel, { _id: tx.objectId as Ref<Channel> }, { limit: 1 })
+    const channel = channels[0]
+    if (channel?.attachedToClass !== contact.class.Person) return undefined
+
+    return channel.attachedTo as Ref<Person>
+  }
+
   /**
    * Returns the covered-class ancestor of the objectClass if one exists in the new permissions model,
    * or undefined if the class is not covered.
diff --git a/foundations/server/packages/middleware/src/tests/guestPermissions.test.ts b/foundations/server/packages/middleware/src/tests/guestPermissions.test.ts
index e124aee8cbe..34b4a5d83a1 100644
--- a/foundations/server/packages/middleware/src/tests/guestPermissions.test.ts
+++ b/foundations/server/packages/middleware/src/tests/guestPermissions.test.ts
@@ -41,6 +41,7 @@ import core, {
   type Tx,
   TxFactory
 } from '@hcengineering/core'
+import contact from '@hcengineering/contact'
 import type { PipelineContext, TxMiddlewareResult } from '@hcengineering/server-core'
 import { GuestPermissionsMiddleware } from '../guestPermissions'
 
@@ -106,6 +107,28 @@ function makeCreateTx (objectClass: Ref<Class<Doc>>, objectSpace: Ref<Space>): T
   return factory.createTxCreateDoc(objectClass, objectSpace, {})
 }
 
+function patchContactHierarchy (mw: GuestPermissionsMiddleware): void {
+  ;(mw as any).context.hierarchy.isDerived = (a: any, b: any) => a === b
+  ;(mw as any).context.hierarchy.hasMixin = (doc: any, mixin: any) =>
+    mixin === contact.mixin.Employee && doc?.employee === true
+}
+
+function makePersonDoc (
+  _id: Ref<Doc>,
+  personUuid: Account['uuid'],
+  employee: boolean = true
+): Doc {
+  return {
+    _id,
+    _class: contact.class.Person,
+    space: 'contact:space:Contacts' as Ref<Space>,
+    modifiedOn: Date.now(),
+    modifiedBy: 'test' as PersonId,
+    personUuid,
+    employee
+  } as any
+}
+
 // Helper: buildGuestSettings - simulate the document that loadPermissionsCache would find
 function makeGuestSettingsDoc (allowedPermissions: Ref<Doc>[], disabledPermissions?: Ref<Doc>[]): Doc {
   return {
@@ -157,6 +180,122 @@ describe('GuestPermissionsMiddleware', () => {
     })
   })
 
+  // ─── User contact mutability ────────────────────────────────────────────────
+  describe('user contact mutability', () => {
+    it('forbids a user from updating another employee person', async () => {
+      const otherPersonId = generateId() as Ref<Doc>
+      const account = makeAccount(AccountRole.User)
+      const findAll: FindAllFn = async (_ctx, _class, query: any) => {
+        if (_class === contact.class.Person && query?._id === otherPersonId) {
+          return [makePersonDoc(otherPersonId, generateId() as any)]
+        }
+        return []
+      }
+      const mw = makeMiddleware(findAll)
+      patchContactHierarchy(mw)
+
+      const factory = new TxFactory(account.primarySocialId)
+      const tx = factory.createTxUpdateDoc(
+        contact.class.Person as Ref<Class<Doc>>,
+        'core:space:Workspace' as Ref<Space>,
+        otherPersonId,
+        { name: 'Changed' } as any
+      )
+
+      await expect(mw.tx(makeCtx(account), [tx])).rejects.toThrow()
+    })
+
+    it('allows a user to update their own employee person', async () => {
+      const personId = generateId() as Ref<Doc>
+      const account = makeAccount(AccountRole.User)
+      let nextCalled = false
+      const findAll: FindAllFn = async (_ctx, _class, query: any) => {
+        if (_class === contact.class.Person && query?._id === personId) {
+          return [makePersonDoc(personId, account.uuid)]
+        }
+        return []
+      }
+      const mw = makeMiddleware(findAll, async () => {
+        nextCalled = true
+        return {}
+      })
+      patchContactHierarchy(mw)
+
+      const factory = new TxFactory(account.primarySocialId)
+      const tx = factory.createTxUpdateDoc(
+        contact.class.Person as Ref<Class<Doc>>,
+        'core:space:Workspace' as Ref<Space>,
+        personId,
+        { name: 'Changed' } as any
+      )
+
+      await mw.tx(makeCtx(account), [tx])
+      expect(nextCalled).toBe(true)
+    })
+
+    it('forbids a user from updating channels attached to another employee person', async () => {
+      const otherPersonId = generateId() as Ref<Doc>
+      const channelId = generateId() as Ref<Doc>
+      const account = makeAccount(AccountRole.User)
+      const findAll: FindAllFn = async (_ctx, _class, query: any) => {
+        if (_class === contact.class.Person && query?._id === otherPersonId) {
+          return [makePersonDoc(otherPersonId, generateId() as any)]
+        }
+        if (_class === contact.class.Channel && query?._id === channelId) {
+          return [
+            {
+              _id: channelId,
+              _class: contact.class.Channel,
+              space: 'contact:space:Contacts' as Ref<Space>,
+              modifiedOn: Date.now(),
+              modifiedBy: 'test' as PersonId,
+              attachedTo: otherPersonId,
+              attachedToClass: contact.class.Person
+            } as any
+          ]
+        }
+        return []
+      }
+      const mw = makeMiddleware(findAll)
+      patchContactHierarchy(mw)
+
+      const factory = new TxFactory(account.primarySocialId)
+      const tx = factory.createTxUpdateDoc(
+        contact.class.Channel as Ref<Class<Doc>>,
+        'core:space:Workspace' as Ref<Space>,
+        channelId,
+        { value: 'new@example.com' } as any
+      )
+
+      await expect(mw.tx(makeCtx(account), [tx])).rejects.toThrow()
+    })
+
+    it('allows maintainers to update another employee person', async () => {
+      const otherPersonId = generateId() as Ref<Doc>
+      const account = makeAccount(AccountRole.Maintainer)
+      let nextCalled = false
+      const mw = makeMiddleware(
+        async () => [],
+        async () => {
+          nextCalled = true
+          return {}
+        }
+      )
+      patchContactHierarchy(mw)
+
+      const factory = new TxFactory(account.primarySocialId)
+      const tx = factory.createTxUpdateDoc(
+        contact.class.Person as Ref<Class<Doc>>,
+        'core:space:Workspace' as Ref<Space>,
+        otherPersonId,
+        { name: 'Changed' } as any
+      )
+
+      await mw.tx(makeCtx(account), [tx])
+      expect(nextCalled).toBe(true)
+    })
+  })
+
   // ─── DocGuest / ReadOnlyGuest are always forbidden ──────────────────────────
   describe('DocGuest and ReadOnlyGuest', () => {
     it('DocGuest: throws Forbidden for any tx', async () => {
diff --git a/plugins/contact-resources/src/components/ChannelsEditor.svelte b/plugins/contact-resources/src/components/ChannelsEditor.svelte
index b6a8ec54b40..892b3c58928 100644
--- a/plugins/contact-resources/src/components/ChannelsEditor.svelte
+++ b/plugins/contact-resources/src/components/ChannelsEditor.svelte
@@ -18,9 +18,10 @@
   import { createQuery, getClient } from '@hcengineering/presentation'
   import { ButtonKind, ButtonSize, closeTooltip, showPopup } from '@hcengineering/ui'
 
-  import { Channel, ChannelProvider } from '@hcengineering/contact'
+  import { Channel, ChannelProvider, type Person } from '@hcengineering/contact'
   import { restrictionStore } from '@hcengineering/view-resources'
   import contact from '../plugin'
+  import { canEditPersonContactDetails } from '../utils'
   import ChannelsDropdown from './ChannelsDropdown.svelte'
 
   export let attachedTo: Ref<Doc>
@@ -37,6 +38,7 @@
   export let restricted: Ref<ChannelProvider>[] = []
 
   let channels: Channel[] = []
+  let attachedPerson: Person | undefined = undefined
 
   const query = createQuery()
   $: attachedTo &&
@@ -50,17 +52,38 @@
       }
     )
 
+  const personQuery = createQuery()
+  $: if (attachedClass === contact.class.Person) {
+    personQuery.query(
+      contact.class.Person,
+      {
+        _id: attachedTo as Ref<Person>
+      },
+      (res) => {
+        attachedPerson = res[0]
+      }
+    )
+  } else {
+    personQuery.unsubscribe()
+    attachedPerson = undefined
+  }
+
+  $: effectiveEditable =
+    attachedClass === contact.class.Person
+      ? editable && attachedPerson !== undefined && canEditPersonContactDetails(attachedPerson)
+      : editable
+
   const client = getClient()
 
   async function remove (value: Channel | AttachedData<Channel>): Promise<void> {
-    if (!editable) return
+    if (!effectiveEditable) return
     if ('_id' in value) {
       await client.remove(value)
     }
   }
 
   async function saveHandler (value: Channel | AttachedData<Channel>): Promise<void> {
-    if (!editable) return
+    if (!effectiveEditable) return
     if ('_id' in value) {
       await client.update(value, {
         value: value.value
@@ -89,7 +112,7 @@
   {size}
   {length}
   {integrations}
-  {editable}
+  editable={effectiveEditable}
   {restricted}
   {shape}
   {focusIndex}
diff --git a/plugins/contact-resources/src/components/ChannelsPresenter.svelte b/plugins/contact-resources/src/components/ChannelsPresenter.svelte
index 6814a37c1f4..beaf1e4cfc1 100644
--- a/plugins/contact-resources/src/components/ChannelsPresenter.svelte
+++ b/plugins/contact-resources/src/components/ChannelsPresenter.svelte
@@ -14,11 +14,15 @@
 // limitations under the License.
 -->
 <script lang="ts">
-  import type { Channel } from '@hcengineering/contact'
+  import type { Channel, Person } from '@hcengineering/contact'
+  import type { Ref } from '@hcengineering/core'
   import { getResource } from '@hcengineering/platform'
+  import { createQuery } from '@hcengineering/presentation'
   import type { ButtonKind, ButtonSize } from '@hcengineering/ui'
   import { showPopup } from '@hcengineering/ui'
   import { ViewAction } from '@hcengineering/view'
+  import contact from '../plugin'
+  import { canEditPersonContactDetails } from '../utils'
   import ChannelsDropdown from './ChannelsDropdown.svelte'
 
   export let value: Channel[] | Channel | null
@@ -29,6 +33,30 @@
   export let length: 'tiny' | 'short' | 'full' = 'short'
   export let shape: 'circle' | undefined = 'circle'
 
+  let attachedPerson: Person | undefined = undefined
+  const personQuery = createQuery()
+
+  $: channel = Array.isArray(value) ? value[0] : value
+  $: if (channel?.attachedToClass === contact.class.Person) {
+    personQuery.query(
+      contact.class.Person,
+      {
+        _id: channel.attachedTo as Ref<Person>
+      },
+      (res) => {
+        attachedPerson = res[0]
+      }
+    )
+  } else {
+    personQuery.unsubscribe()
+    attachedPerson = undefined
+  }
+
+  $: effectiveEditable =
+    channel?.attachedToClass === contact.class.Person
+      ? editable === true && attachedPerson !== undefined && canEditPersonContactDetails(attachedPerson)
+      : editable
+
   async function _open (ev: CustomEvent): Promise<void> {
     if (ev.detail.presenter !== undefined && Array.isArray(value)) {
       showPopup(ev.detail.presenter, { channel: ev.detail.channel }, 'float')
@@ -44,5 +72,5 @@
 </script>
 
 {#if value}
-  <ChannelsDropdown bind:value {length} {kind} {size} {shape} {editable} on:open={_open} />
+  <ChannelsDropdown bind:value {length} {kind} {size} {shape} editable={effectiveEditable} on:open={_open} />
 {/if}
diff --git a/plugins/contact-resources/src/components/EditPerson.svelte b/plugins/contact-resources/src/components/EditPerson.svelte
index 6acf9046e72..84fada6b615 100644
--- a/plugins/contact-resources/src/components/EditPerson.svelte
+++ b/plugins/contact-resources/src/components/EditPerson.svelte
@@ -14,8 +14,8 @@
 // limitations under the License.
 -->
 <script lang="ts">
-  import { Channel, Person, combineName, getCurrentEmployee, getFirstName, getLastName } from '@hcengineering/contact'
-  import { AccountRole, Ref, getCurrentAccount, hasAccountRole, type AccountUuid } from '@hcengineering/core'
+  import { Channel, Person, combineName, getFirstName, getLastName } from '@hcengineering/contact'
+  import { Ref, getCurrentAccount, type AccountUuid } from '@hcengineering/core'
   import { AttributeEditor, createQuery, getClient, hasResource } from '@hcengineering/presentation'
   import type { PersonRating } from '@hcengineering/rating'
   import ratingPlugin from '@hcengineering/rating'
@@ -27,24 +27,16 @@
   import ChannelsDropdown from './ChannelsDropdown.svelte'
   import ChannelsEditor from './ChannelsEditor.svelte'
   import EditableAvatar from './EditableAvatar.svelte'
+  import { canEditPersonContactDetails } from '../utils'
 
   export let object: Person
   export let readonly: boolean = false
   export let channels: Channel[] | undefined = undefined
 
   const client = getClient()
-  const h = client.getHierarchy()
-
   const account = getCurrentAccount()
-  const me = getCurrentEmployee()
-  $: owner = me === object._id
 
-  function isEditable (owner: boolean, object: Person): boolean {
-    if (owner) return true
-    if (!h.hasMixin(object, contact.mixin.Employee)) return true
-    return hasAccountRole(account, AccountRole.Maintainer)
-  }
-  $: editable = !readonly && isEditable(owner, object)
+  $: editable = !readonly && canEditPersonContactDetails(object)
 
   let avatarEditor: EditableAvatar
 
diff --git a/plugins/contact-resources/src/utils.ts b/plugins/contact-resources/src/utils.ts
index 652b4870948..057d9444fd4 100644
--- a/plugins/contact-resources/src/utils.ts
+++ b/plugins/contact-resources/src/utils.ts
@@ -53,6 +53,7 @@ import {
   type SocialIdentity
 } from '@hcengineering/contact'
 import core, {
+  AccountRole,
   type AccountUuid,
   type AggregateValue,
   type Class,
@@ -60,6 +61,7 @@ import core, {
   type Doc,
   type DocumentQuery,
   getCurrentAccount,
+  hasAccountRole,
   type Hierarchy,
   type IdMap,
   notEmpty,
@@ -110,6 +112,18 @@ export function formatDate (dueDateMs: Timestamp): string {
   })
 }
 
+export function canEditPersonContactDetails (person: Person): boolean {
+  const currentEmployee = getCurrentEmployee()
+  if (currentEmployee === person._id) return true
+
+  const account = getCurrentAccount()
+  if (person.personUuid === account.uuid) return true
+
+  if (!getClient().getHierarchy().hasMixin(person, contact.mixin.Employee)) return true
+
+  return hasAccountRole(account, AccountRole.Maintainer)
+}
+
 export async function employeeSort (client: TxOperations, value: Array<Ref<Employee>>): Promise<Array<Ref<Employee>>> {
   const h = client.getHierarchy()
   return value.sort((a, b) => {