What’s Vulnerable › Vulnerabilities

CVE-2026-79664: Ech0 before 4.7.3 Access Token Revocation Bypass

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-09-23
• Weakness: CWE-613

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: before 4.7.3 — fixed in 4.7.3

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.7.3. Check the vendor advisory for mitigations.

References

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

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