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CVE-2026-96873: Reflected XSS in CirrusSearch debug explain output

• Severity: medium (CVSS 5.5 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-24
• Weakness: CWE-79

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Mediawiki - CirrusSearch extension allows Reflected XSS. This issue affects Mediawiki - CirrusSearch extension through 1.46.0.

Affected products

• The Wikimedia Foundation Mediawiki - CirrusSearch Extension: through 1.46.0

References

• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CirrusSearch/+/1344368
• https://phabricator.wikimedia.org/T435234

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