{"id":"CVE-2026-77610","aliases":["GHSA-q5fm-9mx6-44f4"],"url":"https://o3.security/vulnerability/CVE-2026-77610","summary":"Semantic MediaWiki has a query debug output XSS (`DebugFormatter`)","details":"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, query debug output (`format=debug`, or the `debug` request parameter on `Special:Ask`) is assembled by `SMW\\Query\\DebugFormatter` and emitted as raw HTML. Several of its sinks apply no output-context encoding, so attacker-controlled query input is reflected into the page without escaping. On `Special:Ask` the resulting string is concatenated into the page and sent through `OutputPage::addHTML`, never through the MediaWiki parser or Sanitizer. No special user right is required; an anonymous request suffices. This is a reflected XSS: the payload is taken from the request and echoed in the same response. Exploitation requires the query condition to target a text/blob-typed property (whose value is re-serialized verbatim); the predefined `_txt` properties (`Text`, etc.) that ship on every install satisfy this, so no attacker-created content is needed. Version 7.2.0 patches the issue.","published":"2026-09-18T16:55:01.848Z","modified":"2026-09-19T03:47:21.760127285Z","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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77610.json"},{"type":"WEB","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"},{"type":"ADVISORY","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-q5fm-9mx6-44f4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77610"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T03:47:21.760127285Z"}}