How to fix CVE-2025-21612?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens and content security policies are enforced.

Is PHP affected by CVE-2025-21612?

Organizations using TabberNeue face significant risk from CVE-2025-21612, a cross-site scripting vulnerability rated CVSS 8.6. Attackers could inject malicious scripts to steal user sessions, credentials, or perform actions on behalf of authenticated users.

PHP CVE-2025-21612

HIGH

Cross-site Scripting (XSS) (CWE-79)

2025-01-06 [email protected]

PHP XSS

8.6

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

Low

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:02 vuln.today

CVE Published

Jan 06, 2025 - 16:15 nvd

HIGH 8.6

DescriptionNVD

TabberNeue is a MediaWiki extension that allows the wiki to create tabs. Prior to 2.7.2, TabberTransclude.php doesn't escape the user-supplied page name when outputting, so an XSS payload as the page name can be used here. This vulnerability is fixed in 2.7.2.

AnalysisAI

TabberNeue is a MediaWiki extension that allows the wiki to create tabs. Rated high severity (CVSS 8.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. TabberNeue is a MediaWiki extension that allows the wiki to create tabs. Prior to 2.7.2, TabberTransclude.php doesn't escape the user-supplied page name when outputting, so an XSS payload as the page name can be used here. This vulnerability is fixed in 2.7.2. Version information: Prior to 2.7.2.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-21612 vulnerability details – vuln.today

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