CVE-2016-6334

Cross-site scripting (XSS) vulnerability in the Parser::replaceInternalLinks2 method in MediaWiki...

6.1 MediumFix available

Cross-site scripting (XSS) vulnerability in the Parser::replaceInternalLinks2 method in MediaWiki before 1.23.15, 1.26.x before 1.26.4, and 1.27.x before 1.27.1 allows remote attackers to inject arbitrary web script or HTML via vectors involving replacement of percent encoding in unclosed internal links.

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: Low
Integrity: Low
Availability: None

Exploit likelihood

1.12%Down 0.1 points since Feb 4, 2022

What each source reports

NVD Score used 6.1

Record: CVE-2016-6334
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-6334
Updated: 2026-11-02

EUVDEUVD-2016-7261 No score

Record: EUVD-2016-7261
Updated: 2026-11-03

GitHub AdvisoriesGHSA-9276-9qp2-vqp8 6.1

Cross-site scripting (XSS) vulnerability in the Parser::replaceInternalLinks2 method in MediaWiki...

Record: GHSA-9276-9qp2-vqp8
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

Record: CVE-2016-6334
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2016-6334 6.1

Record: DEBIAN-CVE-2016-6334
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVMGASA-2016-0305 No score

Updated mediawiki packages fix security vulnerability

Check read permission when loading page content in ApiParse (CVE-2016-6331)

Make blocks log users out if $wgBlockDisablesLogin is true (CVE-2016-6332)

Make $wgBlockDisablesLogin also restrict logged in permissions (CVE-2016-6332)

Require login to preview user CSS pages (CVE-2016-6333)

Escape '<' and ']]>' in inline <style> blocks (CVE-2016-6333)

XSS in unclosed internal links (CVE-2016-6334)

API: Generate head items in the context of the given title (CVE-2016-6335)

Do not allow undeleting a revision deleted file if it is the top file (CVE-2016-6336)

The mediawiki package has been updated to version 1.23.15, which contains the above fixes.

Record: MGASA-2016-0305
Updated: 2026-11-02

Affected products

mediawiki

Affected packages

Affected packages
Package	Affected	Fixed
`mediawiki` Debian:12	before 1:1.27.1-1	1:1.27.1-1
`mediawiki` Debian:13	before 1:1.27.1-1	1:1.27.1-1
`mediawiki` Debian:14	before 1:1.27.1-1	1:1.27.1-1
`mediawiki` Mageia:5	before 1.23.15-1.mga5	1.23.15-1.mga5

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2016-6334 is a medium vulnerability (CVSS 6.1) in Mediawiki, published September 16, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.12%, the 66th percentile. Fixed in mediawiki 1:1.27.1-1.