CVE-2026-100678GHSA-6877-g673-f5r8
stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
stoatchat stoatchat
CVSS
8.3HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 30 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 0.15.5stoatchatCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
stoatchat before 0.15.5 fails to enforce account-level attempt limits on MFA login challenges, allowing attackers who know a password to guess TOTP codes with only IP-based rate limiting. Attackers can reuse MFA challenge tickets across multiple failed attempts and distribute guesses across IP addresses to bypass rate limiting and gain account access.
Text from CVE List
Affected versions 2
- stoatchataffected: all versions before 0.15.5CVE List
- stoatchatunaffected: 0.15.5CVE List