Vulnerability Description
Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. 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/security/advisories/GHSA-vqfp-p66c-xrp9
- https://github.com/ether/etherpad/tree/3.1.0
FAQ
What is CVE-2026-55088?
CVE-2026-55088 is a vulnerability with a CVSS score of 6.8 (MEDIUM). Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers...
How severe is CVE-2026-55088?
CVE-2026-55088 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55088?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.