Authentication Bypass by Capture-replay in Etherpad - CVE-2026-55088
Published: September 22, 2026
Vulnerability identifier: #VU151596
CSH Severity: Medium
CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55088
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to impersonate the originating author.
The vulnerability exists due to missing expiration and single-use enforcement in the /tokenTransfer/{uuid} endpoint when redeeming a disclosed token transfer URL. A remote attacker can send a request containing a disclosed transfer UUID to impersonate the originating author.
User interaction is required for a legitimate user to initiate a token transfer and for its UUID to be disclosed.
Affected software
Etherpad
How to mitigate CVE-2026-55088
Install security update from vendor's website.
Etherpad - update to 3.1.0