CVE-2024-34507

An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki before 1.39.7...

7.4 HighFix available

An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki before 1.39.7, 1.40.x before 1.40.3, and 1.41.x before 1.41.1. XSS can occur because of mishandling of the 0x1b character, as demonstrated by Special:RecentChanges#%1b0000000.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.67%Up 0.6 points since May 6, 2024

What each source reports

CVE List Score used 7.4

Record: CVE-2024-34507
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness: CWE-80
Updated: 2026-11-02

EUVDEUVD-2024-34833 7.4

Record: EUVD-2024-34833
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-gwp7-78vh-mpmm 7.4

An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki before 1.39.7...

Record: GHSA-gwp7-78vh-mpmm
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness: CWE-80
Updated: 2026-11-02

NVD 7.4

Record: CVE-2024-34507
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness: CWE-80
Updated: 2026-11-02

OSV 7.4

Record: CVE-2024-34507
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2024-34507 7.4

Record: DEBIAN-CVE-2024-34507
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2024-34507 7.4

Record: UBUNTU-CVE-2024-34507
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Updated: 2026-11-02

OSVBIT-mediawiki-2024-34507 No score

Record: BIT-mediawiki-2024-34507
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mediawiki` Bitnami	before 1.41.1	1.41.1
`mediawiki` Debian:12	before 1:1.39.7-1~deb12u1, plus listed versions 1:1.39.2-11:1.39.4-11:1.39.4-1~deb12u11:1.39.4-21:1.39.5-11:1.39.5-1~deb12u11:1.39.6-1	1:1.39.7-1~deb12u1
`mediawiki` Debian:13	before 1:1.39.7-1	1:1.39.7-1
`mediawiki` Debian:14	before 1:1.39.7-1	1:1.39.7-1
`mediawiki` Ubuntu:18.04:LTS	All versions, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3	None known
`mediawiki` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3 Show 4 moreShow less 1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-34507 is a high vulnerability (CVSS 7.4) in Mediawiki, published May 5, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. Fixed in mediawiki 1.41.1.

References

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