# CVE-2026-79664

## Summary

- **CVE ID:** CVE-2026-79664
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-613
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 25, 2026

## Description

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.

## Affected Products

- lin-snow — Ech0 (0)
- lin-snow — Ech0 (4.7.3)

## References

- [CNA](https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5)
- [CNA](https://www.vulncheck.com/advisories/ech0-before-access-token-revocation-bypass)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._