4.3 MEDIUM
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): LOW
- User interaction (UI): NONE
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): NONE
- Availability impact (A): LOW
Discourse has DoS vulnerability in username change endpoint
Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have an application level denial of service vulnerabilityin the username change functionality at try.discourse.org. The vulnerability allows attackers to cause noticeable server delays and resource exhaustion by sending large JSON payloads to the username preference endpoint PUT /u//preferences/username, resulting in degraded performance for other users and endpoints. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
References
- https://github.com/discourse/discourse/security/advisories/GHSA-rmp6-c9rq-6q7p x_refsource_CONFIRM
Affected products
- ==>= 2025.12.0-latest, < 2025.12.1
- ==>= 2025.11.0-latest, < 2025.11.2
- ==>= 2026.1.0-latest, < 2026.1.0
- ==< 3.5.4
Matching in nixpkgs
pkgs.discourse
Discourse is an open source discussion platform
pkgs.discourseAllPlugins
Discourse is an open source discussion platform
pkgs.discourse-mail-receiver
Helper program which receives incoming mail for Discourse
pkgs.python312Packages.pydiscourse
Python library for working with Discourse
pkgs.python313Packages.pydiscourse
Python library for working with Discourse
pkgs.grafanaPlugins.grafana-discourse-datasource
Allows users to search and view topics, posts, users, tags, categories, and reports on a given Discourse forum through Grafana
Package maintainers
-
@talyz Kim Lindberger <kim.lindberger@gmail.com>
-
@Dettorer Paul Hervot <paul.hervot@dettorer.net>
-
@nagisa Simonas Kazlauskas <nixpkgs@kazlauskas.me>