CVE-2026-79662

HIGHPre-NVD 8.08.0—
EchelonGraph scoreHIGH confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. a secondary CVSS source baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.0Exploit: Elevated riskExposed: 0

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

Ech0 through 4.5.6 contains an OAuth redirect URI validation vulnerability in parseAndValidateClientRedirect (internal/service/auth/auth.go) that compares only the scheme and host of the client-supplied redirect_uri against the admin-configured allowlist, ignoring path, query, and fragment components. The redirect_uri is embedded into the signed state JWT at login time without validation. An attacker can craft a redirect_uri whose host matches an allowed origin but whose path is attacker-influenced; after the OAuth exchange the victim is redirected to that path with a one-time exchange code in the query string. If the code leaks (e.g., via Referer, analytics, or an open redirect on that host), the attacker can trade it at the public POST /api/auth/exchange endpoint for the victim's access and refresh tokens. Fixed in 4.7.3.

CVSS v3
8.0
EG Score
8.0(high)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity80% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
9%
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 OAuth Redirect URI Validation Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ech0-before-oauth-redirect-uri-validation-bypass
github Patch Available🟡 PoC Available

OAuth redirect URI validation ignores path component, enables exchange-code theft · Advisory · lin-snow/Ech0 · GitHub

https://github.com/lin-snow/Ech0/security/advisories/GHSA-p64j-f4x9-wq66

Vendor Advisories for CVE-2026-79662(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/lin-snow/ech0—1.4.8-0.20260503040728-a7e8b8e84bd1—
github.com/lin-snow/Ech0—1.4.8-0.20260503040728-a7e8b8e84bd1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 24× 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. 2026-08-30 02:39 UTCEG score recompute
  2. 2026-08-30 02:39 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 13:28 UTCGHSA enrichment
  5. 2026-08-29 00:17 UTCEG score recompute
  6. 2026-08-29 00:17 UTCGHSA enrichment
  7. 2026-08-28 21:42 UTCEPSS rescore
  8. 2026-08-28 09:25 UTCGHSA enrichment
  9. 2026-08-27 20:10 UTCEG score recompute
  10. 2026-08-27 20:09 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 06:56 UTCGHSA enrichment
  13. 2026-08-26 17:46 UTCEG score recompute
  14. 2026-08-26 17:46 UTCGHSA enrichment
  15. 2026-08-26 14:47 UTCEPSS rescore
  16. 2026-08-26 04:31 UTCEG score recompute
  17. 2026-08-26 04:31 UTCGHSA enrichment
  18. 2026-08-25 15:21 UTCEG score recompute
  19. 2026-08-25 15:21 UTCGHSA enrichment
  20. 2026-08-25 14:56 UTCEG score recompute
  21. 2026-08-25 14:56 UTCGHSA enrichment
  22. 2026-08-25 12:17 UTCEG score recompute
  23. 2026-08-25 11:42 UTCEG score recompute
  24. 2026-08-25 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79662?
CVE-2026-79662 is a high vulnerability published on August 25, 2026. Ech0 through 4.5.6 contains an OAuth redirect URI validation vulnerability in parseAndValidateClientRedirect (internal/service/auth/auth.go) that compares only the scheme and host of the client-supplied redirecturi against the admin-configured allowlist, ignoring path, query, and fragment…
When was CVE-2026-79662 disclosed?
CVE-2026-79662 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-2026-79662 actively exploited?
CVE-2026-79662 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 91.1% of all scored CVEs.
What is the CVSS score of CVE-2026-79662?
CVE-2026-79662 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2026-79662?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79662, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-79662

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