Vulnerability Description
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 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d99
- https://github.com/ether/etherpad/pull/7784
- https://github.com/ether/etherpad/releases/tag/v3.1.0
- https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h
FAQ
What is CVE-2026-55086?
CVE-2026-55086 is a vulnerability with a CVSS score of 4.2 (MEDIUM). 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...
How severe is CVE-2026-55086?
CVE-2026-55086 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55086?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.