CVE-2026-55086

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.

• CWE-59
• CWE-377

• https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996
• 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
• https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h

Published

Aug 19, 2026

Last Modified

Sep 9, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-55079Coder allows organizations to provision remote development e…6.5
• CVE-2026-5508The WowPress plugin for WordPress is vulnerable to Stored Cr…6.4
• CVE-2026-55081DHIS2 is a flexible information system for data capture, man…7.3
• CVE-2026-55082DHIS2 is a flexible information system for data capture, man…8.7
• CVE-2026-55084DHIS2 is a flexible information system for data capture, man…8.8
• CVE-2026-55085Etherpad is a real-time collaborative editor. Prior to 3.3.1…9.6
• CVE-2026-55087Etherpad is a real-time collaborative editor. From 2.1.0 unt…6.1
• CVE-2026-55088Etherpad is a real-time collaborative editor. From 2.6.0 unt…6.8
• CVE-2026-55089Etherpad is a real-time collaborative editor. From 2.1.0 unt…9.9
• CVE-2026-5509An authenticated command injection vulnerability exists in t…7.2
• CVE-2026-55090Etherpad is a real-time collaborative editor. Prior to 3.3.0…5.3
• CVE-2026-55091flat-to-nested converts a hierarchy from a flat representati…7.5