TI-2025-33431 Aliases CVE-2025-53486 GHSA-p6wr-jj4q-jc36

WikiCategoryTagCloud: Reflected Cross-Site Scripting (XSS) via linkstyle attribute in parser function

MEDIUM 58CWE-79Published 2025-07-07 · Updated 2025-07-07

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping. An attacker can inject JavaScript event handlers such as onmouseenter using carefully crafted input via the {{#tag:tagcloud}} parser function, resulting in arbitrary JavaScript execution when a victim hovers over a link in the category cloud. The vulnerability exists because the linkstyle parameter is only passed through Sanitizer::checkCss() (which does not escape HTML) and is then directly inserted into a style attribute using string concatenation instead of Html::element or Html::openElement. This issue affects Mediawiki - WikiCategoryTagCloud extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0029 21st percentileScored 2026-11-07

Fix Fixed Mediawiki - WikiCategoryTagCloud extension (Wikimedia Foundation): 1.39.13, 1.42.7, 1.43.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Wikimedia Foundation	Mediawiki - WikiCategoryTagCloud extension	1.39.x to before 1.39.13; 1.42.x to before 1.42.7; 1.43.x to before 1.43.2	1.39.13, 1.42.7, 1.43.2	Patch available	CNA

Mediawiki - WikiCategoryTagCloud extension VendorWikimedia Foundation Affected 1.39.x to before 1.39.13; 1.42.x to before 1.42.7; 1.43.x to before 1.43.2 Fixed in 1.39.13, 1.42.7, 1.43.2 Patch available CNA

Remediation

Fix · CNA Mediawiki - WikiCategoryTagCloud extension (Wikimedia Foundation) Fixed in 1.39.13, 1.42.7, 1.43.2

Timeline

2026-10-02 Threatist record created from CVE-2025-53486
2026-10-03 Alias added: GHSA-p6wr-jj4q-jc36

References

Other 2

TI-2025-11006 The compare API module breaks Extension:Lockdown CVSS 4.0CRITICAL 10.0
TI-2024-32110 Backticks can allow the usage of not-allowed SQL functions CVSS 4.0HIGH 8.8
TI-2026-65500 Unauthenticated SQL injection in UserPageViewTracker via filterusers and ignoreusers parameters CVSS 3.1HIGH 7.5
TI-2026-64588 DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion) CVSS 3.1HIGH 7.5
TI-2026-42112 SQLi in Cargo extension via year range filter CVSS 4.0MEDIUM 6.9
TI-2026-42110 Stored XSS through Cargo's map format CVSS 4.0MEDIUM 6.9

See all 255 →

Sources

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