CVE-2026-79664: critical vulnerability in lin-snow Ech0
Ech0 before 4.7.3 Access Token Revocation Bypass
Published · Updated
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.4%
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
lin-snow · Ech0Related CVEs — lin-snow Ech0
In the same product, most dangerous first.
CVE-2026-35037HIGHEch0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadataEPSS 0.6%CVE-2026-79665HIGHEch0 before 4.5.1 Authorization Bypass via Session TokensEPSS 0.5%CVE-2026-79658HIGHEch0 before 5.0.1 Denial of Service via Accept-LanguageEPSS 0.5%CVE-2026-33638MEDIUMEch0 authenticated user-list exposed data via public `/api/allusers` endpointEPSS 0.5%CVE-2026-79668MEDIUMEch0 before 4.7.3 Unauthenticated Like Endpoint Metric InflationEPSS 0.4%CVE-2026-79661MEDIUMEch0 before 4.7.3 Unauthenticated fav_count ModificationEPSS 0.4%