Persistent authenticated access via failed token revocation
Published Aug 25, 2026 · Updated Aug 25, 2026
Insufficient session expiration in lin-snow Ech0 before 4.7.3 allows remote attackers holding a stolen never-expire token to retain access. Logout dereferences a nil ExpiresAt field, RevokeToken rejects a zero remaining lifetime, and administrative deletion removes metadata without blacklisting the JTI. Exploitation requires theft of a never-expire token, which retains its assigned scopes until the instance JWT signing secret changes.
Summary
What happened
Insufficient session expiration in lin-snow Ech0 before 4.7.3 allows remote attackers holding a stolen never-expire token to retain access. Logout dereferences a nil ExpiresAt field, RevokeToken rejects a zero remaining lifetime, and administrative deletion removes metadata without blacklisting the JTI. Exploitation requires theft of a never-expire token, which retains its assigned scopes until the instance JWT signing secret changes.
The record
- CVE
- CVE-2026-79664
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- lin-snow
- Product
- Ech0
- Classifications
- CWE-755, CWE-613, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <4.7.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-fpw6-hrg5-q5x5 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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