Live › vulnerability › CVE-2026-116878
Go to dashboardSemantic MediaWiki versions from 2.5.0 before 7.3.1 let anonymous visitors send requests to Special:PropertyLabelSimilarity with limit=0, which removes the SQL limit and forces quadratic string comparisons. Repeated requests can exhaust PHP CPU, memory and database connections, making the wiki unavailable.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-27 11:31 UTC. All times on this page are UTC.
Sites running Semantic MediaWiki from 2.5.0 up to but not including 7.3.1 are exposed, and the exposure is greatest on public wikis where anonymous users can reach Special:PropertyLabelSimilarity. Private wikis that require login before any page is served are less exposed, though the sources do not state this explicitly. Sites already on 7.3.1 or later are not affected.
No product ranges from the sources yet.
mediawiki/semantic-media-wiki7.3.1 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
Semantic MediaWiki from 2.5.0 before 7.3.1 contains an uncontrolled resource consumption vulnerability that allows anonymous attackers to force quadratic computation by supplying a zero limit to Special:PropertyLabelSimilarity. Attackers can send repeated requests with limit=0 to bypass the SQL LIMIT and trigger pairwise similar_text() comparisons, exhausting PHP CPU, memory, and database connections.
This page as .md · .json · in your agent: get_signal("CVE-2026-116878")
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