CVE-2026-79664

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-25. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.4
EG Score
7.4(high)
EG Risk
49(Track*)
EG Risk 49/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Ech0 before 4.7.3 Access Token Revocation Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ech0-before-access-token-revocation-bypass
github Patch Available🟡 PoC Available

Access tokens with expiry=never cannot be revoked: logout panics, delete does not blacklist JTI · Advisory · lin-snow/Ech0 · GitHub

https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5

Vendor Advisories for CVE-2026-79664(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 15× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-27 10:37 UTCGHSA enrichment
  3. 2026-08-26 23:19 UTCEG score recompute
  4. 2026-08-26 23:19 UTCGHSA enrichment
  5. 2026-08-26 14:47 UTCEPSS rescore
  6. 2026-08-26 12:00 UTCGHSA enrichment
  7. 2026-08-26 00:41 UTCEG score recompute
  8. 2026-08-26 00:41 UTCGHSA enrichment
  9. 2026-08-25 13:22 UTCEG score recompute
  10. 2026-08-25 13:22 UTCGHSA enrichment
  11. 2026-08-25 13:16 UTCEG score recompute
  12. 2026-08-25 13:16 UTCGHSA enrichment
  13. 2026-08-25 12:17 UTCEG score recompute
  14. 2026-08-25 11:42 UTCEG score recompute
  15. 2026-08-25 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79664?
CVE-2026-79664 is a high vulnerability published on August 25, 2026. 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,…
When was CVE-2026-79664 disclosed?
CVE-2026-79664 was first published in the National Vulnerability Database on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79664 actively exploited?
CVE-2026-79664 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 88.0% of all scored CVEs.
What is the CVSS score of CVE-2026-79664?
CVE-2026-79664 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-79664?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79664, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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