{"id":"CVE-2026-100678","revision":"31cba3a4064d4e84bf7c736cf89046b4","records":[{"revision":"31cba3a4064d4e84bf7c736cf89046b4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-100678","aliases":[],"title":"stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting","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.","state":0,"publishedAt":"2026-09-26T13:23:40.935+00:00","modifiedAt":"2026-09-30T15:00:30.44+00:00","affected":[{"ecosystem":"Vendor product","name":"stoatchat","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"stoatchat\",\n                    \"product\": \"stoatchat\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"0.15.5\"\n                        },\n                        {\n                            \"version\": \"0.15.5\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.3,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/stoatchat/stoatchat/security/advisories/GHSA-6877-g673-f5r8","https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-mfa-brute-force-via-insufficient-rate-limiting"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-100678","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-100678","identifiers":["CVE-2026-100678"]},"retained":false,"historicalAffected":[]}],"coverage":[]}