Is CVE-2026-77606 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-77606?

CVE-2026-77606 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-77606

Description

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, when `headers=plain`, table header text was emitted into `<th>` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML. Version 7.2.0 fixes the issue.