CVE-2026-55088
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Etherpad versions 2.6.0 to 3.1.0 have a vulnerability in the token transfer mechanism where an author token is stored and exposed via GET /tokenTransfer/{uuid} without expiration or removal after redemption. An unauthenticated attacker who obtains the UUID can repeatedly redeem it, receive fresh author cookies, and impersonate the author.
Risk Assessment
The risk includes unauthorized access to pads, ability to read and write content, and identity theft. The attack does not require authentication if the UUID is known.
Recommendation
Upgrade Etherpad to version 3.1.0 or later. Also, consider implementing token expiration and one-time use mechanisms.
Original NVD description (English source)
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.