CVE-2023-37252 Information disclosure in CheckUser
Low 3.1
Published
Updated
Check this codebase for CVE-2023-37252 and fix it if it is affected.
What it is: CVE-2023-37252 is a low-severity vulnerability in MediaWiki CheckUser, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37252 exists.
Affected product: MediaWiki CheckUser. 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-2023-37252/ (Markdown: https://insights.sbomify.com/CVE-2023-37252/index.md)
The CheckUser extension improperly reveals hidden usernames in logs, allowing attackers to view sensitive user data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-37252?
CVE-2023-37252 is a low-severity vulnerability in MediaWiki CheckUser, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.
Weakness: CWE-669
Which versions are affected by CVE-2023-37252?
How do I fix CVE-2023-37252?
No fix has been published for CVE-2023-37252 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-37252 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37252 exists.
Sources
Also known as GHSA-v83r-4pqq-r3wj.