{"id":"CVE-2026-100678","published":"2026-09-26T14:16:51.857","lastModified":"2026-09-28T16:36:05.010","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","cwes":["CWE-307"],"vendors":[],"products":[],"references":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-6877-g673-f5r8","tags":[]},{"url":"https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-mfa-brute-force-via-insufficient-rate-limiting","tags":[]}],"exploitRefs":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-6877-g673-f5r8","tags":[]}],"hasPoc":true,"ai":null}