{"id":"CVE-2026-77606","aliases":["GHSA-3jp5-3h47-28qf"],"url":"https://o3.security/vulnerability/CVE-2026-77606","summary":"Semantic MediaWiki has reflected XSS in Special:Ask plain table headers","details":"#### Failure mode\n\nWhen `headers=plain`, table header text was emitted into `<th>` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML.\n\n#### Remediation\n\n- `TableResultPrinter` now applies output-context escaping before passing plain headers to the table renderer.\n- The fix is limited to the HTML/plain-header branch so safe rendering modes are unaffected.\n\n#### Why this is the right layer\n\nThe header value is not a structural token; it is display data. Sanitizing it at the sink is correct because the renderer owns the final HTML emission.","published":"2026-09-18T16:41:42.731Z","modified":"2026-10-28T02:30:23.277514824Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"mediawiki/semantic-media-wiki","fixedVersion":"7.2.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77606.json"},{"type":"ADVISORY","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-3jp5-3h47-28qf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77606"},{"type":"PACKAGE","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:23.277514824Z"}}