Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck
CVE-2026-100678stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
Medium 6.5
In plain English
A medium-severity security flaw in stoatchat from stoatchat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 77.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-307 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- GitHub Security Advisory (GHSA-6877-g673-f5r8) vendor-advisory
- VulnCheck Advisory: stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting third-party-advisory