diff --git a/lib/Controller/GroupController.php b/lib/Controller/GroupController.php
index 63d339216..735301d73 100644
--- a/lib/Controller/GroupController.php
+++ b/lib/Controller/GroupController.php
@@ -171,7 +171,7 @@ public function rename(string $newGroupName,
 			$groups);
 
 		if (!empty($groups)
-			&& in_array($newGroupName, $groupsNameSearched)) {
+			&& in_array($newGroupName, $groupsNameSearched, true)) {
 			return new JSONResponse(
 				'This group already exists. Please, use another name',
 				Http::STATUS_CONFLICT
@@ -486,7 +486,7 @@ public function search(string $pattern, ?bool $ignoreSpaces = null, array $group
 			});
 		}
 
-		$groups = array_filter($groups, fn ($group) => !in_array($group->getGID(), $groupsPresents));
+		$groups = array_filter($groups, fn ($group) => !in_array($group->getGID(), $groupsPresents, true));
 
 		$groupsFormatted = GroupFormatter::formatGroups($groups);
 
diff --git a/lib/Controller/WorkspaceApiOcsController.php b/lib/Controller/WorkspaceApiOcsController.php
index 25f03457b..64c05903a 100644
--- a/lib/Controller/WorkspaceApiOcsController.php
+++ b/lib/Controller/WorkspaceApiOcsController.php
@@ -519,7 +519,7 @@ public function removeUsersFromGroup(int $id, string $gid, array $uids): DataRes
 		$gids = array_keys($space['groups']);
 		$spacename = $space['name'];
 
-		if (!in_array($gid, $gids)) {
+		if (!in_array($gid, $gids, true)) {
 			throw new OCSException("Group {$gid} does not belongs to the {$spacename} workspace.");
 		}
 
@@ -599,7 +599,7 @@ public function addUsersToGroup(int $id, string $gid, array $uids): Response {
 		$gids = array_keys($workspace['groups']);
 		$spacename = $workspace['name'];
 
-		if (!in_array($gid, $gids)) {
+		if (!in_array($gid, $gids, true)) {
 			throw new OCSForbiddenException("Group {$gid} does not belongs to the {$spacename} workspace.");
 		}
 
diff --git a/lib/Group/SubGroups/SubGroup.php b/lib/Group/SubGroups/SubGroup.php
index 9aa16f179..10e4bc508 100644
--- a/lib/Group/SubGroups/SubGroup.php
+++ b/lib/Group/SubGroups/SubGroup.php
@@ -73,7 +73,7 @@ public function create(string $groupname, int $id, string $spacename): IGroup {
 		$groupnames = array_map(fn ($group) => $group->getDisplayName(), $groupsSearched);
 
 		if (!is_null($group)) {
-			if (in_array($displayName, $groupnames)) {
+			if (in_array($displayName, $groupnames, true)) {
 				throw new GroupException("Group with display name $displayName already exists.", Http::STATUS_CONFLICT);
 			}
 		}
diff --git a/lib/Service/Group/ConnectedGroupsService.php b/lib/Service/Group/ConnectedGroupsService.php
index f8050f06d..5b60b5bea 100644
--- a/lib/Service/Group/ConnectedGroupsService.php
+++ b/lib/Service/Group/ConnectedGroupsService.php
@@ -59,7 +59,7 @@ public function getSpacesByGroups(array $gids): array {
 		$linkedSpaceGroupsByUserGroups = [];
 		$linkedSpaceGroupsByUserGroups = array_filter($linkedSpaceGroups, function ($spaceGid) use ($gids, $linkedSpaceGroups) {
 			foreach ($gids as $gid) {
-				if (isset($linkedSpaceGroups[$spaceGid]) && in_array($gid, $linkedSpaceGroups[$spaceGid])) {
+				if (isset($linkedSpaceGroups[$spaceGid]) && in_array($gid, $linkedSpaceGroups[$spaceGid], true)) {
 					return true;
 				}
 			}
@@ -100,7 +100,7 @@ public function isConnectedToWorkspace(string $gid, array $spaceGids) : bool {
 
 		foreach ($spaceGids as $spaceGid) {
 			if (isset($linkedSpaceGroups[$spaceGid])) {
-				return in_array($gid, $linkedSpaceGroups[$spaceGid]);
+				return in_array($gid, $linkedSpaceGroups[$spaceGid], true);
 			}
 		}
 		return false;
@@ -156,7 +156,7 @@ public function hasConnectedGroups(string $gid, ?string $gidUserGroup = null) :
 		if (!is_null($gidUserGroup)) {
 			$values = $linkedSpaceGroups[$gidUserGroup];
 			if (!is_null($values)) {
-				return in_array($gid, $values);
+				return in_array($gid, $values, true);
 			}
 			return false;
 		}
@@ -183,10 +183,10 @@ public function add(IGroup $group, Space $space): bool {
 	 * @param string $uid user UID
 	 * @param string $spaceUserGid space-u group
 	 */
-	public function isStrictSpaceUser(string $uid, string $spaceUserGid) {
+	public function isStrictSpaceUser(string $uid, string $spaceUserGid): bool {
 		if (!isset($this->strictSpaceUsers[$spaceUserGid])) {
 			$this->strictSpaceUsers[$spaceUserGid] = $this->mapper->getStrictSpaceUserIds($spaceUserGid);
 		}
-		return in_array($uid, $this->strictSpaceUsers[$spaceUserGid]);
+		return in_array($uid, $this->strictSpaceUsers[$spaceUserGid], true);
 	}
 }
diff --git a/lib/Service/Group/GroupsWorkspaceService.php b/lib/Service/Group/GroupsWorkspaceService.php
index 9c100dfc5..515a48615 100644
--- a/lib/Service/Group/GroupsWorkspaceService.php
+++ b/lib/Service/Group/GroupsWorkspaceService.php
@@ -78,8 +78,8 @@ public function getGroupsUserFromGroupfolder(IUser $user, array $groupfolder, st
 		$groups = [];
 		foreach ($this->groupManager->getUserGroups($user) as $group) {
 			if (
-				in_array($group->getGID(), array_keys($groupfolder['groups']))
-				|| in_array($group->getGID(), $groupsWorkspace)
+				in_array($group->getGID(), array_keys($groupfolder['groups']), true)
+				|| in_array($group->getGID(), $groupsWorkspace, true)
 			) {
 				array_push($groups, $group->getGID());
 			}
diff --git a/lib/Service/UserService.php b/lib/Service/UserService.php
index ba092cf0f..ef8f6008c 100644
--- a/lib/Service/UserService.php
+++ b/lib/Service/UserService.php
@@ -83,7 +83,7 @@ public function formatUser(IUser $user, array $space, string $role): ?array {
 		}
 
 		foreach ($this->groupManager->getUserGroups($user) as $group) {
-			if (in_array($group->getGID(), array_keys($space['groups'])) || $this->connectedGroups->isConnectedToWorkspace($group->getGID(), array_keys($space['groups']))) {
+			if (in_array($group->getGID(), array_keys($space['groups']), true) || $this->connectedGroups->isConnectedToWorkspace($group->getGID(), array_keys($space['groups']))) {
 				array_push($groups, $group->getGID());
 			}
 		}
diff --git a/lib/Share/Group/ShareMembersOnlyFilter.php b/lib/Share/Group/ShareMembersOnlyFilter.php
index 09e6d56ee..22dd6c7fc 100644
--- a/lib/Share/Group/ShareMembersOnlyFilter.php
+++ b/lib/Share/Group/ShareMembersOnlyFilter.php
@@ -62,7 +62,7 @@ public function filterUsersGroupOnly(array $users): array {
 			$users,
 			function ($user) use ($usersInTheSameGroup) {
 				$usernames = array_values(array_map(fn ($user) => $user->getUID(), $usersInTheSameGroup));
-				return in_array($user->getUID(), $usernames);
+				return in_array($user->getUID(), $usernames, true);
 			});
 
 		return $usersInTheSameGroup;
diff --git a/lib/Space/SpaceManager.php b/lib/Space/SpaceManager.php
index 39eeebbd5..b669c1807 100644
--- a/lib/Space/SpaceManager.php
+++ b/lib/Space/SpaceManager.php
@@ -419,7 +419,7 @@ public function renameGroups(int $spaceId, string $oldSpacename, string $newSpac
 		}
 
 		$groups = array_map(fn ($gid) => $this->groupManager->get($gid), $gids);
-		$groups = array_filter($groups, fn ($group) => !in_array('LDAP', $group->getBackendNames()));
+		$groups = array_filter($groups, fn ($group) => !in_array('LDAP', $group->getBackendNames(), true));
 
 		foreach ($groups as $group) {
 			$newGroupName = str_replace($oldSpacename, $newSpacename, $group->getDisplayName());
diff --git a/lib/Users/UserFormatter.php b/lib/Users/UserFormatter.php
index 07f744094..762453fdd 100644
--- a/lib/Users/UserFormatter.php
+++ b/lib/Users/UserFormatter.php
@@ -29,7 +29,7 @@ public function formatUser(IUser $user, array $space, string $role): array {
 		// Gets the workspace subgroups the user is member of
 		$groups = [];
 		foreach ($this->groupManager->getUserGroups($user) as $group) {
-			if (in_array($group->getGID(), array_keys($space['groups']))) {
+			if (in_array($group->getGID(), array_keys($space['groups']), true)) {
 				array_push($groups, $group->getGID());
 			}
 		}