--- attacher.c.orig	2025-05-22 11:29:37.805021734 +0000
+++ attacher.c	2025-05-22 11:29:42.281014540 +0000
@@ -148,7 +148,7 @@ int how;
   struct msg m;
   struct stat st;
   char *s;
-  bool is_socket;
+  bool is_socket = 0;
 
   debug2("Attach: how=%d, tty=%s\n", how, attach_tty);
 #ifdef MULTIUSER
@@ -225,9 +225,16 @@ int how;
   strncpy(m.m_tty, attach_tty_is_in_new_ns ? attach_tty_name_in_ns : attach_tty, sizeof(m.m_tty) - 1);
   m.m_tty[sizeof(m.m_tty) - 1] = 0;
 
-  is_socket = IsSocket(SockPath);
   if (how == MSG_WINCH)
     {
+#if defined(MULTIUSER) && defined(USE_SETEUID)
+      if (multiattach)
+	{
+	  xseteuid(real_uid);
+	  xsetegid(real_gid);
+	}
+#endif
+      is_socket = IsSocket(SockPath);
       if ((lasts = MakeClientSocket(0, is_socket)) >= 0)
 	{
 	  WriteMessage(lasts, &m);
@@ -238,6 +245,14 @@ int how;
 
   if (how == MSG_CONT)
     {
+#if defined(MULTIUSER) && defined(USE_SETEUID)
+      if (multiattach)
+	{
+	  xseteuid(real_uid);
+	  xsetegid(real_gid);
+	}
+#endif
+      is_socket = IsSocket(SockPath);
       if ((lasts = MakeClientSocket(0, is_socket)) < 0)
         {
           Panic(0, "Sorry, cannot contact session \"%s\" again.\r\n",