How severe is CVE-2023-29139?

CVE-2023-29139 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-29139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-29139?

CVE-2023-29139 affects Mediawiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-29139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-29139 published?

CVE-2023-29139 was published on 2023-03-31 and last updated on 2026-06-17.

CVE-2023-29139

CVE-2023-29139 is a medium-severity vulnerability in Mediawiki with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Mediawiki
Published: 2023-03-31
Last modified: 2026-06-17

Description

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. When a user with checkuserlog permissions makes many CheckUserLog API requests in some configurations, denial of service can occur (RequestTimeoutException or upstream request timeout).

Frequently asked questions

What is CVE-2023-29139?: An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. When a user with checkuserlog permissions makes many CheckUserLog API requests in some configurations, denial of service can occur (RequestTimeoutException or upstream request timeout).
How severe is CVE-2023-29139?: CVE-2023-29139 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-29139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-29139?: CVE-2023-29139 affects Mediawiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-29139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-29139 published?: CVE-2023-29139 was published on 2023-03-31 and last updated on 2026-06-17.

References

https://phabricator.wikimedia.org/T326293

Affected products (1)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*

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