{"id":"CVE-2026-91021","state":"PUBLISHED","title":"CVE-2026-91021","description":"Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site scripting (XSS) vulnerability in the share renderer for webView notes due to improper HTML escaping of user-controlled #webViewSrc values. This vulnerability allows attackers with note-authoring privileges to inject arbitrary JavaScript that executes for any user who opens the shared note, including administrators.","publishedAt":"2026-09-14T17:13:51.770Z","updatedAt":"2026-09-14T19:41:39.660Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"certcc","products":["Trilium Trillium Notes"],"affected":[{"vendor":"Trilium","product":"Trillium Notes","versions":[{"version":"0","status":"affected","lessThanOrEqual":"v0.103.0","versionType":"custom"}]}],"references":["https://vokecyber.com/research/trilium-share-renderer-stored-xss"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/91xxx/CVE-2026-91021.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-91021","state":"PUBLISHED","datePublished":"2026-09-14T17:13:51.770Z","dateUpdated":"2026-09-14T19:41:39.660Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-09-14T17:02:03.736Z"},"containers":{"cna":{"title":"CVE-2026-91021","descriptions":[{"lang":"en","value":"Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site scripting (XSS) vulnerability in the share renderer for webView notes due to improper HTML escaping of user-controlled #webViewSrc values. This vulnerability allows attackers with note-authoring privileges to inject arbitrary JavaScript that executes for any user who opens the shared note, including administrators."}],"affected":[{"vendor":"Trilium","product":"Trillium Notes","versions":[{"version":"0","status":"affected","lessThanOrEqual":"v0.103.0","versionType":"custom"}]}],"references":[{"url":"https://vokecyber.com/research/trilium-share-renderer-stored-xss"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]},{"descriptions":[{"lang":"en","description":"CWE-116 Improper Encoding or Escaping of Output"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-09-14T17:13:51.770Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.46","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-91021"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":5.4,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T19:41:10.009376Z","id":"CVE-2026-91021","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","type":"CWE","lang":"en","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T19:41:39.660Z"}}]}}}