{"id":"CVE-2026-79664","title":"Ech0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers to maintain perpetual authenticated access after token theft","summary":"Ech0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers to maintain perpetual authenticated access after token theft. Three independent revocation mechanisms fail: logout panics on ni…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-613"],"vendor":"lin-snow","product":"github.com/lin-snow/ech0","affected":["github.com/lin-snow/ech0 < 1.4.8-0.20260503041146-eab62379c795"],"patched":["github.com/lin-snow/ech0 1.4.8-0.20260503041146-eab62379c795"],"published":"2026-08-25","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:14:58.577","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-79664","references":[{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/ech0-before-access-token-revocation-bypass","label":"disclosure@vulncheck.com"},{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/lin-snow/Ech0/commit/eab62379c795c3f4850a9ca938ae3f27d7171541"},{"url":"https://github.com/lin-snow/Ech0"}],"tags":["nvd","osv","go","cve.org","exploit-available"],"epss":0.00356,"epssPercentile":0.29167,"aliases":["GHSA-fpw6-hrg5-q5x5","GO-2026-5375"],"ecosystem":"go","ingestedAt":"2026-08-27T19:27:46.782Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-25T13:01:28.361955Z"},"slug":"CVE-2026-79664","body":"## Overview\n\nEch0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers to maintain perpetual authenticated access after token theft. Three independent revocation mechanisms fail: logout panics on nil ExpiresAt field, RevokeToken skips when remainTTL is zero, and admin delete does not blacklist the JTI, leaving stolen tokens cryptographically valid until JWT secret rotation.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-79664)\n\nAffected packages:\n\n- `github.com/lin-snow/ech0 < 1.4.8-0.20260503041146-eab62379c795`\n\nPatched in:\n\n- `github.com/lin-snow/ech0 1.4.8-0.20260503041146-eab62379c795`\n\nSource: https://osv.dev/vulnerability/GHSA-fpw6-hrg5-q5x5","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":218194,"id":"CVE-2026-79664","ts":1791478551803,"field":"exploit_available","old":"false","new":"true"}]}