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01 Record

CVE-2023-37252

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

LowPUBLISHEDCNA: mitre
CNA base score3.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

02 Description

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

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.24% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 15.0% of scored records. A rank, not a probability.
NVD base score
3.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-09-16.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-14 00:00Z1 MO AGO
Last updated
2026-09-14 16:16Z1 MO AGO
Reserved
2023-06-29
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Low (CVSS 3.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
  • CWE-669Incorrect Resource Transfer Between SpheresClass
Data version
5.2
Document digest
69cd14f39dd4ca9ef1eab40ea506acb461f1c2a79a23aa8bc155c155da6c8e42

05 Affected products

VendorProductVersionsPlatforms
MediaWikiCheckUser0 to < 1.35.11, 1.36.0 to < 1.38.7, 1.39.0 to < 1.39.4—

06 References