CVE-2026-67335

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-01. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 1, 2026

Last Modified

August 3, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available. Sources: github.
generic

better-auth before 1.6.2 OAuth State Validation Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/better-auth-before-oauth-state-validation-bypass
github Patch Available

OAuth callback accepts mismatched `state` when cookie-backed state storage is used without PKCE · Advisory · better-auth/better-auth · GitHub

https://github.com/better-auth/better-auth/security/advisories/GHSA-wxw3-q3m9-c3jr

Vendor Advisories for CVE-2026-67335(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
better-auth—1.6.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 61× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 21:42 UTCGHSA enrichment
  3. 2026-08-19 22:49 UTCEG score recompute
  4. 2026-08-19 22:49 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 23:56 UTCEG score recompute
  7. 2026-08-18 23:55 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 01:02 UTCEG score recompute
  10. 2026-08-18 01:02 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-17 02:09 UTCEG score recompute
  13. 2026-08-17 02:09 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 03:16 UTCEG score recompute
  16. 2026-08-16 03:16 UTCGHSA enrichment
  17. 2026-08-15 04:23 UTCEG score recompute
  18. 2026-08-15 04:23 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 05:30 UTCEG score recompute
  21. 2026-08-14 05:30 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 06:37 UTCEG score recompute
  24. 2026-08-13 06:37 UTCGHSA enrichment
  25. 2026-08-12 13:51 UTCEPSS rescore
Show 36 more
  1. 2026-08-12 07:44 UTCEG score recompute
  2. 2026-08-12 07:44 UTCGHSA enrichment
  3. 2026-08-11 08:51 UTCEG score recompute
  4. 2026-08-11 08:51 UTCGHSA enrichment
  5. 2026-08-11 00:00 UTCEPSS rescore
  6. 2026-08-10 09:58 UTCEG score recompute
  7. 2026-08-10 09:58 UTCGHSA enrichment
  8. 2026-08-09 13:47 UTCEPSS rescore
  9. 2026-08-09 11:06 UTCEG score recompute
  10. 2026-08-09 11:06 UTCGHSA enrichment
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-08 12:12 UTCEG score recompute
  13. 2026-08-08 12:12 UTCGHSA enrichment
  14. 2026-08-07 13:18 UTCGHSA enrichment
  15. 2026-08-06 14:25 UTCEG score recompute
  16. 2026-08-06 14:25 UTCGHSA enrichment
  17. 2026-08-06 13:47 UTCEPSS rescore
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-05 15:31 UTCGHSA enrichment
  21. 2026-08-04 16:34 UTCEG score recompute
  22. 2026-08-04 16:34 UTCGHSA enrichment
  23. 2026-08-04 15:10 UTCEPSS rescore
  24. 2026-08-04 10:39 UTCEPSS rescore
  25. 2026-08-03 17:40 UTCEG score recompute
  26. 2026-08-03 17:40 UTCGHSA enrichment
  27. 2026-08-03 16:19 UTCEG score recompute
  28. 2026-08-03 16:19 UTCGHSA enrichment
  29. 2026-08-03 11:11 UTCEG score recompute
  30. 2026-08-03 11:11 UTCGHSA enrichment
  31. 2026-08-03 10:36 UTCEPSS rescore
  32. 2026-08-02 12:14 UTCEG score recompute
  33. 2026-08-02 12:13 UTCGHSA enrichment
  34. 2026-08-01 13:19 UTCEG score recompute
  35. 2026-08-01 12:44 UTCEG score recompute
  36. 2026-08-01 12:42 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67335?
CVE-2026-67335 is a medium vulnerability published on August 1, 2026. better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the…
When was CVE-2026-67335 disclosed?
CVE-2026-67335 was first published in the National Vulnerability Database on August 1, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67335 actively exploited?
CVE-2026-67335 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 93.0% of all scored CVEs.
What is the CVSS score of CVE-2026-67335?
CVE-2026-67335 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-67335?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67335, 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-2026-67335

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