{"id":"CVE-2026-77610","title":"Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages","summary":"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`)…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"SemanticMediaWiki","product":"SemanticMediaWiki","affected":["SemanticMediaWiki < 7.2.0"],"patched":["mediawiki/semantic-media-wiki 7.2.0"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:11.897","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77610","references":[{"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0","label":"security-advisories@github.com"},{"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-q5fm-9mx6-44f4","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-q5fm-9mx6-44f4"}],"tags":["nvd","cve.org","ghsa","composer"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T19:30:37.465065Z"},"epss":0.00155,"epssPercentile":0.04994,"aliases":["GHSA-q5fm-9mx6-44f4"],"ecosystem":"composer","ingestedAt":"2026-09-18T17:46:41.524Z","slug":"CVE-2026-77610","body":"## Overview\n\nSemantic 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-77610)\n\nAffected packages:\n\n- `mediawiki/semantic-media-wiki <= 7.1.0`\n\nPatched in:\n\n- `mediawiki/semantic-media-wiki 7.2.0`\n\nSource: https://github.com/advisories/GHSA-q5fm-9mx6-44f4","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}