8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-21612

CVE-2025-21612: Cross-site Scripting in TabberTransclude in Extension:TabberNeue

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-21612

CVE-2025-21612:

8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable NoTech Impact Total

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→SSVCScheduled60 days

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
starcitizentools/tabber-neue	composer	>= 1.9.1, < 2.7.2	2.7.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The primary vulnerability stems from the buildTabTransclude function in TabberNeueHooks.php. In the original code (introduced in d8c3db4), $pageName (user-controlled input) was directly interpolated into an HTML error message via sprintf() without escaping. This was patched in f229cab by adding Sanitizer::escapeHtmlAllowEntities(). The PoC demonstrates this vector by injecting a <script> tag via the page name parameter. The other two reported issues were deemed invalid/unreachable: (1) recursiveTagParse usage in Tabber.php is mitigated by MediaWiki's parser sanitization, and (2) TabberParsoid.php's code was unused. The confidence is high due to the reproducible PoC and explicit patch addressing this specific code path.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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