CVE-2026-100678 stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
Attackers can bypass MFA by brute-forcing TOTP codes due to insufficient rate limiting, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100678?
CVE-2026-100678 is a high-severity authentication bypass vulnerability in stoatchat, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-307
Which versions are affected by CVE-2026-100678?
How do I fix CVE-2026-100678?
No fix has been published for CVE-2026-100678 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-100678 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100678 exists.
Sources
Also known as GHSA-6877-g673-f5r8, GHSA-qgwf-mjq4-r7pg.