CVE-2026-79664

HIGH 7.4

Ech0 before 4.7.3 Access Token Revocation Bypass

CVSS Score

7.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-613
Vendor	lin-snow
Product	ech0
Published	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

lin-snow / Ech0

0 < 4.7.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 adrgs aisafe-bot