What’s Vulnerable › Vulnerabilities

CVE-2023-29141

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-31 · updated 2026-06-17
• Weakness: CWE-444

Description

An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An auto-block can occur for an untrusted X-Forwarded-For header.

Affected products

• Fedoraproject Fedora: 37
• Wikimedia Foundation MediaWiki: before 1.35.10; from 1.36.0 before 1.38.6; from 1.39.0 before 1.39.3 — fixed in 1.35.10, 1.38.6, 1.39.3

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.10, 1.38.6, 1.39.3. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39
• https://lists.debian.org/debian-lts-announce/2023/08/msg00029.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONWHGOBFD6CQAEGOP5O375XAP2N6RUHT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGK4NZPIJ5ET2ANRZOUYPCRIB5I64JR7/
• https://phabricator.wikimedia.org/T285159
• https://www.debian.org/security/2023/dsa-5447
• https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39
• https://lists.debian.org/debian-lts-announce/2023/08/msg00029.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONWHGOBFD6CQAEGOP5O375XAP2N6RUHT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGK4NZPIJ5ET2ANRZOUYPCRIB5I64JR7/
• https://phabricator.wikimedia.org/T285159
• https://www.debian.org/security/2023/dsa-5447

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