Vulnerability in Lin-Snow Ech0
CVE-2026-79664
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-fpw6-hrg5-q5x5) (vendor-advisory)
- VulnCheck Advisory: Ech0 before 4.7.3 Access Token Revocation Bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79664?
- CVE-2026-79664 is a high-severity vulnerability in Lin-Snow Ech0, classified under Insufficient Session Expiration. CVSS score: 7.4/10. Published 2026-08-25.
- How severe is CVE-2026-79664?
- High severity. CVSS v3 base score is 7.4 out of 10.