CVE-2025-6589 Information disclosure in MediaWiki
Low 2.1
Published
Updated
Check this codebase for CVE-2025-6589 and fix it if it is affected.
What it is: CVE-2025-6589 is a low-severity vulnerability in Wikimedia Foundation MediaWiki, published on 2 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-6589 in the wild and no public exploit code.
Affected product: Wikimedia Foundation MediaWiki. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-6589/ (Markdown: https://insights.sbomify.com/CVE-2025-6589/index.md)
Attackers can view hidden usernames in the BlockList when MultiBlocks are enabled, exposing private user data.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-6589?
CVE-2025-6589 is a low-severity vulnerability in Wikimedia Foundation MediaWiki, published on 2 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/specials/pagers/BlockListPager.Php.
This issue affects MediaWiki: >= 1.42.0.
Weakness: CWE-22
Which versions are affected by CVE-2025-6589?
How do I fix CVE-2025-6589?
Apply the vendor's patch.
Is CVE-2025-6589 being exploited?
There is no known exploitation of CVE-2025-6589 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-6589, GHSA-mv9h-82v8-3r9p, UBUNTU-CVE-2025-6589.