{"id":"CVE-2026-55085","title":"Etherpad is a real-time collaborative editor","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 ol start attribute before assigning the generated m…","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L","cwe":["CWE-79"],"published":"2026-08-19","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:15:59.613","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55085","references":[{"url":"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/pull/7937","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/releases/tag/v3.3.1","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00452,"epssPercentile":0.38633,"ingestedAt":"2026-09-09T21:22:45.542Z","slug":"CVE-2026-55085","body":"## Overview\n\nEtherpad 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}