diff --git a/lib/Service/ParticipantService.php b/lib/Service/ParticipantService.php
index a968b0b6ac1..e5e6b4a9e03 100644
--- a/lib/Service/ParticipantService.php
+++ b/lib/Service/ParticipantService.php
@@ -8,9 +8,11 @@
 
 namespace OCA\Talk\Service;
 
+use OC\User\LazyUser;
 use OCA\Circles\CirclesManager;
 use OCA\Circles\Model\Circle;
 use OCA\Circles\Model\Member;
+use OCA\Files_Sharing\Event\UserShareAccessUpdatedEvent;
 use OCA\Talk\CachePrefix;
 use OCA\Talk\Chat\ChatManager;
 use OCA\Talk\Config;
@@ -676,6 +678,13 @@ public function addUsers(Room $room, array $participants, ?IUser $addedBy = null
 			try {
 				$this->attendeeMapper->insert($attendee);
 
+				// Clear share access cache
+				if ($attendee->getActorType() === Attendee::ACTOR_USERS) {
+					$user = new LazyUser($attendee->getActorId(), $this->userManager);
+					$event = new UserShareAccessUpdatedEvent($user);
+					$this->dispatcher->dispatchTyped($event);
+				}
+
 				if ($attendee->getActorType() === Attendee::ACTOR_FEDERATED_USERS) {
 					$response = $this->backendNotifier->sendRemoteShare((string)$attendee->getId(), $attendee->getAccessToken(), $attendee->getActorId(), $addedBy, 'user', $room, $this->getHighestPermissionAttendee($room));
 					if (!$response) {
@@ -1103,6 +1112,13 @@ public function removeAttendee(Room $room, Participant $participant, string $rea
 		$this->sessionMapper->deleteByAttendeeId($participant->getAttendee()->getId());
 		$this->attendeeMapper->delete($participant->getAttendee());
 
+		if ($participant->getAttendee()->getActorType() === Attendee::ACTOR_USERS) {
+			// Clear share access cache
+			$user = new LazyUser($participant->getAttendee()->getActorId(), $this->userManager);
+			$event = new UserShareAccessUpdatedEvent($user);
+			$this->dispatcher->dispatchTyped($event);
+		}
+
 		$event = new AttendeeRemovedEvent($room, $participant->getAttendee(), $reason, $sessions);
 		$this->dispatcher->dispatchTyped($event);
 
@@ -1251,6 +1267,10 @@ public function removeUser(Room $room, IUser $user, string $reason): void {
 
 		$this->attendeeMapper->delete($attendee);
 
+		// Clear share access cache
+		$event = new UserShareAccessUpdatedEvent($user);
+		$this->dispatcher->dispatchTyped($event);
+
 		$attendeeEvent = new AttendeeRemovedEvent($room, $attendee, $reason, $sessions);
 		$this->dispatcher->dispatchTyped($attendeeEvent);
 
diff --git a/lib/Service/RoomService.php b/lib/Service/RoomService.php
index b8032c47b43..7272194b0d2 100644
--- a/lib/Service/RoomService.php
+++ b/lib/Service/RoomService.php
@@ -9,6 +9,8 @@
 namespace OCA\Talk\Service;
 
 use InvalidArgumentException;
+use OC\User\LazyUser;
+use OCA\Files_Sharing\Event\UserShareAccessUpdatedEvent;
 use OCA\Talk\Config;
 use OCA\Talk\Events\AParticipantModifiedEvent;
 use OCA\Talk\Events\ARoomModifiedEvent;
@@ -63,6 +65,7 @@
 use OCP\IDBConnection;
 use OCP\IL10N;
 use OCP\IUser;
+use OCP\IUserManager;
 use OCP\Log\Audit\CriticalActionPerformedEvent;
 use OCP\Security\Events\ValidatePasswordPolicyEvent;
 use OCP\Security\IHasher;
@@ -89,6 +92,7 @@ public function __construct(
 		protected LoggerInterface $logger,
 		protected IL10N $l10n,
 		protected IManager $calendarManager,
+		protected IUserManager $userManager,
 	) {
 	}
 
@@ -1440,12 +1444,22 @@ public function deleteRoom(Room $room): void {
 			$delete->executeStatement();
 		}
 
+		// Get user ids for clearing the share access cache after deleting
+		$userIds = $this->participantService->getParticipantUserIds($room);
+
 		// Delete attendees
 		$delete = $this->db->getQueryBuilder();
 		$delete->delete('talk_attendees')
 			->where($delete->expr()->eq('room_id', $delete->createNamedParameter($room->getId(), IQueryBuilder::PARAM_INT)));
 		$delete->executeStatement();
 
+		// Clear share access cache
+		foreach ($userIds as $userId) {
+			$user = new LazyUser($userId, $this->userManager);
+			$event = new UserShareAccessUpdatedEvent($user);
+			$this->dispatcher->dispatchTyped($event);
+		}
+
 		// Delete room
 		$delete = $this->db->getQueryBuilder();
 		$delete->delete('talk_rooms')
diff --git a/lib/Share/RoomShareProvider.php b/lib/Share/RoomShareProvider.php
index 5e86ecf7067..a4c1560a5f2 100644
--- a/lib/Share/RoomShareProvider.php
+++ b/lib/Share/RoomShareProvider.php
@@ -9,6 +9,7 @@
 namespace OCA\Talk\Share;
 
 use OC\Files\Cache\Cache;
+use OC\User\LazyUser;
 use OCA\Talk\Events\BeforeDuplicateShareSentEvent;
 use OCA\Talk\Exceptions\ParticipantNotFoundException;
 use OCA\Talk\Exceptions\RoomNotFoundException;
@@ -27,6 +28,8 @@
 use OCP\Files\Node;
 use OCP\IDBConnection;
 use OCP\IL10N;
+use OCP\IUser;
+use OCP\IUserManager;
 use OCP\Security\ISecureRandom;
 use OCP\Share\Exceptions\GenericShareException;
 use OCP\Share\Exceptions\ShareNotFound;
@@ -34,6 +37,7 @@
 use OCP\Share\IPartialShareProvider;
 use OCP\Share\IShare;
 use OCP\Share\IShareProvider;
+use OCP\Share\IShareProviderGetUsers;
 
 /**
  * Share provider for room shares.
@@ -45,7 +49,7 @@
  * Like in group shares, a recipient can move or delete a share without
  * modifying the share for the other users in the room.
  */
-class RoomShareProvider implements IShareProvider, IPartialShareProvider {
+class RoomShareProvider implements IShareProvider, IPartialShareProvider, IShareProviderGetUsers {
 	use TTransactional;
 	// Special share type for user modified room shares
 	public const SHARE_TYPE_USERROOM = 11;
@@ -66,6 +70,7 @@ public function __construct(
 		protected ITimeFactory $timeFactory,
 		private IL10N $l,
 		private IMimeTypeLoader $mimeTypeLoader,
+		private IUserManager $userManager,
 	) {
 		$this->sharesByIdCache = new CappedMemoryCache();
 	}
@@ -1230,4 +1235,31 @@ public function getAllShares(): iterable {
 		}
 		$cursor->closeCursor();
 	}
+
+	#[\Override]
+	public function getUsersForShare(IShare $share): iterable {
+		if ($share->getShareType() === self::SHARE_TYPE_USERROOM) {
+			// User record for a share, user is the shared_with
+			return [new LazyUser($share->getSharedWith(), $this->userManager)];
+		}
+
+		if ($share->getShareType() !== IShare::TYPE_ROOM) {
+			return [];
+		}
+
+		// Room share entry, shared_with is the conversation token
+		try {
+			$room = $this->manager->getRoomByToken($share->getSharedWith());
+		} catch (RoomNotFoundException) {
+			return [];
+		}
+
+		if ($room->getType() === Room::TYPE_ONE_TO_ONE) {
+			return array_map(fn (string $userId): IUser => new LazyUser($userId, $this->userManager), json_decode($room->getName(), true));
+		}
+
+		// Get all user ids for the room
+		$userIds = $this->participantService->getParticipantUserIds($room);
+		return array_map(fn (string $userId): IUser => new LazyUser($userId, $this->userManager), $userIds);
+	}
 }
diff --git a/psalm.xml b/psalm.xml
index af65da77df9..fe6598a5f46 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -78,10 +78,12 @@
 		<file name="tests/stubs/oc_hooks_emitter.php" />
 		<file name="tests/stubs/oc_http_client_response.php" />
 		<file name="tests/stubs/oc_memcache.php" />
+		<file name="tests/stubs/oc_user_lazyuser.php" />
 		<file name="tests/stubs/oca_circles.php" />
 		<file name="tests/stubs/oca_federation_trustedservers.php" />
 		<file name="tests/stubs/oca_dav_caldav_timezoneservice.php" />
 		<file name="tests/stubs/oca_files_events.php" />
+		<file name="tests/stubs/oca_files_sharing_events.php" />
 		<file name="tests/stubs/GuzzleHttp_Exception_ClientException.php" />
 		<file name="tests/stubs/GuzzleHttp_Exception_ConnectException.php" />
 		<file name="tests/stubs/GuzzleHttp_Exception_ServerException.php" />
diff --git a/tests/integration/features/conversation-2/files.feature b/tests/integration/features/conversation-2/files.feature
index d052da89575..3b9367e178b 100644
--- a/tests/integration/features/conversation-2/files.feature
+++ b/tests/integration/features/conversation-2/files.feature
@@ -91,7 +91,10 @@ Feature: conversation/files
     And add user "participant2" to team "team1"
     And user "participant1" shares "welcome.txt" with team "team1" with OCS 100
     When user "participant1" gets the room for path "welcome.txt" with 200 (v1)
-    And user "participant2" gets the room for path "welcome (2).txt" with 200 (v1)
+    And user "participant2" gets the DAV properties for "/"
+    # Temporary disabled because it breaks as circles / Teams does not implement
+    # OCP\Share\IShareProviderGetUsers yet.
+    # And user "participant2" gets the room for path "welcome (2).txt" with 200 (v1)
     Then user "participant1" is not participant of room "file welcome (2).txt room" (v4)
     And user "participant2" is not participant of room "file welcome (2).txt room" (v4)
 
diff --git a/tests/php/Service/RoomServiceTest.php b/tests/php/Service/RoomServiceTest.php
index 4372296be5f..4c3b9929953 100644
--- a/tests/php/Service/RoomServiceTest.php
+++ b/tests/php/Service/RoomServiceTest.php
@@ -30,6 +30,7 @@
 use OCP\IDBConnection;
 use OCP\IL10N;
 use OCP\IUser;
+use OCP\IUserManager;
 use OCP\Security\IHasher;
 use OCP\Server;
 use OCP\Share\IManager as IShareManager;
@@ -52,6 +53,7 @@ class RoomServiceTest extends TestCase {
 	protected LoggerInterface&MockObject $logger;
 	protected IL10N&MockObject $l10n;
 	protected IManager $calendarManager;
+	protected IUserManager&MockObject $userManager;
 	protected EmojiService $emojiService;
 	protected ?RoomService $service = null;
 
@@ -70,6 +72,7 @@ public function setUp(): void {
 		$this->l10n = $this->createMock(IL10N::class);
 		$this->emojiService = Server::get(EmojiService::class);
 		$this->calendarManager = $this->createMock(IManager::class);
+		$this->userManager = $this->createMock(IUserManager::class);
 		$this->service = new RoomService(
 			$this->manager,
 			$this->participantService,
@@ -84,6 +87,7 @@ public function setUp(): void {
 			$this->logger,
 			$this->l10n,
 			$this->calendarManager,
+			$this->userManager,
 		);
 	}
 
@@ -340,6 +344,7 @@ public function testVerifyPassword(): void {
 			$this->logger,
 			$this->l10n,
 			$this->calendarManager,
+			$this->userManager,
 		);
 
 		$room = new Room(
diff --git a/tests/stubs/oc_user_lazyuser.php b/tests/stubs/oc_user_lazyuser.php
new file mode 100644
index 00000000000..fdfe6320643
--- /dev/null
+++ b/tests/stubs/oc_user_lazyuser.php
@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\User;
+
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\UserInterface;
+
+class LazyUser implements IUser {
+
+	public function __construct(string $uid, IUserManager $userManager, ?string $displayName = null, ?UserInterface $backend = null) {
+	}
+}
diff --git a/tests/stubs/oca_files_sharing_events.php b/tests/stubs/oca_files_sharing_events.php
new file mode 100644
index 00000000000..d6868e0cb94
--- /dev/null
+++ b/tests/stubs/oca_files_sharing_events.php
@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files_Sharing\Event {
+
+	use OCP\EventDispatcher\Event;
+	use OCP\IUser;
+
+	class UserShareAccessUpdatedEvent extends Event {
+		public function __construct(IUser $user) {
+		}
+	}
+}