From 168c9c55e99b271b8a036401af03fdd47938d1f1 Mon Sep 17 00:00:00 2001
From: Andrey Zvonov <32552679+zvonand@users.noreply.github.com>
Date: Wed, 28 Jan 2026 15:41:45 +0100
Subject: [PATCH] Merge pull request #1342 from
 Altinity/backports/25.8.15/86633

25.8.15 Stable Backport of #86633 - Add support for user names in config containing a dot
---
 src/Access/UsersConfigAccessStorage.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Access/UsersConfigAccessStorage.cpp b/src/Access/UsersConfigAccessStorage.cpp
index e0cab5b337e8..f3aed9f17403 100644
--- a/src/Access/UsersConfigAccessStorage.cpp
+++ b/src/Access/UsersConfigAccessStorage.cpp
@@ -115,7 +115,7 @@ namespace
 
     UserPtr parseUser(
         const Poco::Util::AbstractConfiguration & config,
-        const String & user_name,
+        String user_name,
         const std::unordered_set<UUID> & allowed_profile_ids,
         const std::unordered_set<UUID> & allowed_role_ids,
         bool allow_no_password,
@@ -123,8 +123,12 @@ namespace
     {
         const bool validate = true;
         auto user = std::make_shared<User>();
-        user->setName(user_name);
         String user_config = "users." + user_name;
+
+        /// If the user name contains a dot, it is escaped with a backslash when parsed from the config file.
+        /// We need to remove the backslash to get the correct user name.
+        Poco::replaceInPlace(user_name, "\\.", ".");
+        user->setName(user_name);
         bool has_no_password = config.has(user_config + ".no_password");
         bool has_password_plaintext = config.has(user_config + ".password");
         bool has_password_sha256_hex = config.has(user_config + ".password_sha256_hex");