{"id":"CVE-2026-43887","state":"PUBLISHED","title":"Outline: Stored XSS via Comment Mentions","description":"Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, the Outline comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions. As a result, potentially dangerous protocols (e.g., javascript:) are not filtered, introducing a risk of client-side code execution. This vulnerability is fixed in 1.7.0.","publishedAt":"2026-05-11T21:05:42.302Z","updatedAt":"2026-05-15T18:23:58.951Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["outline outline"],"affected":[{"vendor":"outline","product":"outline","versions":[{"version":">= 0.84.0, < 1.7.0","status":"affected"}]}],"references":["https://github.com/outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43887.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43887","state":"PUBLISHED","datePublished":"2026-05-11T21:05:42.302Z","dateUpdated":"2026-05-15T18:23:58.951Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-04T15:17:09.330Z"},"containers":{"cna":{"title":"Outline: Stored XSS via Comment Mentions","descriptions":[{"lang":"en","value":"Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, the Outline comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions. As a result, potentially dangerous protocols (e.g., javascript:) are not filtered, introducing a risk of client-side code execution. This vulnerability is fixed in 1.7.0."}],"affected":[{"vendor":"outline","product":"outline","versions":[{"version":">= 0.84.0, < 1.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh","name":"https://github.com/outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-11T21:05:42.302Z"},"source":{"advisory":"GHSA-rqrg-f3qc-xvgh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-15T18:23:44.004712Z","id":"CVE-2026-43887","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-15T18:23:58.951Z"}}]}}}