{"id":"CVE-2026-77607","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-77607","summary":"Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS","details":"#### Failure mode\n\n`sep` was inserted verbatim into the HTML that joins a table cell's values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard `Special:Ask` render and for its raw request output (`request_type=raw`), so the injection was reachable without authentication.\n\n#### Remediation\n\n- In all non-wiki output modes (HTML, raw request, file), `sep` is escaped unless it is a safe `<br>` variant.\n- This preserves legitimate line-break separators while blocking markup injection.\n\n#### Maintenance note\n\nIf the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.","published":"2026-09-18T16:50:01Z","modified":"2026-09-18T17:00:04.982447202Z","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/security/advisories/GHSA-7xv3-gf2g-498h"},{"type":"PACKAGE","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki"},{"type":"WEB","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T17:00:04.982447202Z"}}