3.1

CVE-2023-37252: mediawiki checkuser

CVSS: 3.1v3.1LowAwaiting analysis
Published 14-09-2026Last modified 14-09-2026
Open JSON

Vulnerability summary

CVE-2023-37252 is a low (CVSS 3.1) vulnerability in mediawiki checkuser. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.4% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
3.1/10
010
Low · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-09-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.04 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mediawiki1 product
  • checkuser< 1.35.11 | ≥ 1.36.0, < 1.38.7 | ≥ 1.39.0, < 1.39.4

1 vendor · 1 product

References

1 links