{"schema":"threatline.record/2","record":{"id":"CVE-2026-100678","aliases":["GHSA-6877-g673-f5r8"],"summary":"stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting","details":"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.","categories":["Unclassified"],"product":"stoatchat","vendor":"stoatchat","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100678","source_modified_at":"2026-09-30T15:00:30.440Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"stoatchat","vendor":"stoatchat","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"0.15.5"},{"version":"0.15.5","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100678","source_modified_at":"2026-09-30T15:00:30.440Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"stoatchat","ecosystem":null},"version":"0.15.5","basis":"first unaffected version stated in the CVE record"}],"cvss":8.3,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00242,"percentile":0.14554,"score_date":"2026-10-23"},"published_at":"2026-09-26T13:23:40.935Z","modified_at":"2026-09-30T15:00:30.440Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100678","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T15:00:30.440Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100678","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-6877-g673-f5r8","tags":["exploit"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-mfa-brute-force-via-insufficient-rate-limiting","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-30T14:59:59.255314Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T15:00:30.440Z","content_hash":"29f5649f3f1f253a3facba28889ef9162751c715ebc7d846d4c2c060c7f2f6b6"}}