SB2026110842 - Multiple vulnerabilities in Etherpad

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Main Vulnerability Database SB2026110842

SB2026110842 - Multiple vulnerabilities in Etherpad

Published: November 8, 2026

Security Bulletin ID SB2026110842
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: N/A)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated remote attacker to read private pads' chat and full revision histories and inject chat messages and saved revisions.

The vulnerability exists due to a time-of-check time-of-use race in Etherpad's collaboration handlers that lets a concurrent pad connection change the target after authorization. An unauthenticated remote attacker can join an accessible pad and race messages against a connection to an unauthorized pad, causing authorized operations to execute against that pad.


Remediation

Install update from vendor's website.

References