{"id":"CVE-2026-55085","state":"PUBLISHED","title":"Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite","description":"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.","publishedAt":"2026-08-19T19:34:27.269Z","updatedAt":"2026-08-21T19:47:13.022Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["ether etherpad"],"affected":[{"vendor":"ether","product":"etherpad","versions":[{"version":"< 3.3.1","status":"affected"}]}],"references":["https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","https://github.com/ether/etherpad/pull/7937","https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319","https://github.com/ether/etherpad/releases/tag/v3.3.1"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55085.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55085","state":"PUBLISHED","datePublished":"2026-08-19T19:34:27.269Z","dateUpdated":"2026-08-21T19:47:13.022Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T14:41:54.578Z"},"containers":{"cna":{"title":"Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"ether","product":"etherpad","versions":[{"version":"< 3.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","name":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/ether/etherpad/pull/7937","name":"https://github.com/ether/etherpad/pull/7937","tags":["x_refsource_MISC"]},{"url":"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319","name":"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319","tags":["x_refsource_MISC"]},{"url":"https://github.com/ether/etherpad/releases/tag/v3.3.1","name":"https://github.com/ether/etherpad/releases/tag/v3.3.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L","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":"2026-08-19T19:34:27.269Z"},"source":{"advisory":"GHSA-f7h5-v9hm-548j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-21T19:46:45.454820Z","id":"CVE-2026-55085","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":"2026-08-21T19:47:13.022Z"}}]}}}