{"id":"CVE-2026-55085","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-55085","summary":"Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted…","details":"Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.","published":"2026-08-19T20:17:17.280","modified":"2026-08-19T20:17:17.280","cvss":{"score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319","label":"ether/etherpad@d828185"},"references":[{"type":"WEB","url":"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319"},{"type":"WEB","url":"https://github.com/ether/etherpad/pull/7937"},{"type":"WEB","url":"https://github.com/ether/etherpad/releases/tag/v3.3.1"},{"type":"WEB","url":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-19T20:17:17.280"}}