CVE-2026-100678
stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
- State
- Published
- Severity
- 8.3 High
- Published
- Sep 26, 2026
- Updated
- Sep 30, 2026
- Reserved
- Sep 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-307 Improper Restriction of Excessive Authentication Attempts
Affected Products
| Product | Versions |
|---|---|
stoatchatstoatchat |
|
References
- GitHub Security Advisory (GHSA-6877-g673-f5r8)vendor-advisory
- VulnCheck Advisory: stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limitingthird-party-advisory
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