{"id":"CVE-2026-55086","title":"Etherpad is a real-time collaborative editor","summary":"Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared wo…","severity":"medium","cvss":4.2,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-59","CWE-377"],"vendor":"ep_etherpad-lite","product":"ep_etherpad-lite","affected":["ep_etherpad-lite <= 3.0.0"],"patched":["ep_etherpad-lite 3.1.0"],"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-2026-55086","references":[{"url":"https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/pull/7784","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/releases/tag/v3.1.0","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-2jwf-f4xq-f24h"}],"tags":["nvd","ghsa","npm"],"epss":0.00175,"epssPercentile":0.07314,"aliases":["GHSA-2jwf-f4xq-f24h"],"ecosystem":"npm","ingestedAt":"2026-08-13T15:03:46.197Z","slug":"CVE-2026-55086","body":"## Overview\n\nEtherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55086)\n\nAffected packages:\n\n- `ep_etherpad-lite <= 3.0.0`\n\nPatched in:\n\n- `ep_etherpad-lite 3.1.0`\n\nSource: https://github.com/advisories/GHSA-2jwf-f4xq-f24h","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":23.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}