CVE-2026-126567: XSS (CVSS 5.4)

Description

Semantic MediaWiki 3.0.0 before 7.4.1 contains a stored cross-site scripting vulnerability in Special:Ask with the ElasticStore backend, allowing users with edit rights to inject script through unescaped native_result and score_set output. Attackers can store markup in a Text property or subobject name, then lure victims including administrators to a crafted Special:Ask link to execute script in their session.

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CVSS v3.1 Score

5.4

MEDIUM

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

EPSS — Exploit Prediction

0.0023

Probability of exploitation

0.14%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/MediaWiki/Specials/SpecialAsk.php#L512-L521 https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Query/ScoreSet.php#L128-L140 https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/fca9922835f4353e67a71cfef4d527d46e7c3ad3 https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1 https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7j96-w9cc-r7rq https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.4.1-stored-xss-via-special-ask-debug-output

Frequently Asked Questions

What is CVE-2026-126567? +

Semantic MediaWiki 3.0.0 before 7.4.1 contains a stored cross-site scripting vulnerability in Special:Ask with the ElasticStore backend, allowing users with edit rights to inject script through unescaped native_result and score_set output. Attackers can store markup in a Text property or subobject name, then lure victims including administrators to a crafted Special:Ask link to execute script in their session. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-126567? +

CVE-2026-126567 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0023, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-126567? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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