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Vulnerability record · CVE-2023-29141 · published 31 March 2023

CVE-2023-29141: Mediawiki http request smuggling vulnerability

Mediawiki · Mediawiki

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.

9.8 CVSS 3.1 Critical EPSS 1.2% · top 33.2% CWE-444 · HTTP request smuggling
9.8CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
13References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39 Release Notes
https://lists.debian.org/debian-lts-announce/2023/08/msg00029.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONWHGOBFD6CQAEGOP5O375X
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGK4NZPIJ5ET2ANRZOUYPCR
https://phabricator.wikimedia.org/T285159 Issue TrackingPermissions Required
https://www.debian.org/security/2023/dsa-5447
https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39 Release Notes
https://lists.debian.org/debian-lts-announce/2023/08/msg00029.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONWHGOBFD6CQAEGOP5O375X
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGK4NZPIJ5ET2ANRZOUYPCR
https://phabricator.wikimedia.org/T285159 Issue TrackingPermissions Required
https://www.debian.org/security/2023/dsa-5447
https://phabricator.wikimedia.org/T285159 Issue TrackingPermissions Required

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Source: NIST National Vulnerability Database (record CVE-2023-29141), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.