{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100678","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-26T02:36:51.809Z","datePublished":"2026-09-26T13:23:40.935Z","dateUpdated":"2026-09-26T13:23:40.935Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-26T13:23:40.935Z"},"datePublic":"2026-09-11T00:00:00.000Z","title":"stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Restriction of Excessive Authentication Attempts","cweId":"CWE-307","type":"CWE"}]}],"affected":[{"vendor":"stoatchat","product":"stoatchat","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"0.15.5"},{"version":"0.15.5","status":"unaffected","versionType":"semver"}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.3,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-6877-g673-f5r8","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-6877-g673-f5r8)"},{"name":"VulnCheck Advisory: stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-mfa-brute-force-via-insufficient-rate-limiting"}],"credits":[{"lang":"en","value":"QuentinRa","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}}}}