CVE-2026-66400

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-07-29. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: Elevated riskExposed: 0

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

Grav Login Plugin versions before 3.8.13 contain an insufficient session expiration vulnerability in TokenStorage.php where the findTriplet() method fails to properly validate Remember Me token timestamps. Attackers with a captured Remember Me cookie can authenticate indefinitely instead of the configured timeout period, as the expiry check compares an array to a scalar value which always evaluates incorrectly in PHP.

CVSS v3
4.8
EG Score
4.8(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity48% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 29, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Grav Login Plugin before 3.8.13 Insufficient Session Expiration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-login-plugin-before-insufficient-session-expiration
github Patch Available🟡 PoC Available

Insufficient Session Expiration · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-mj78-8gwc-vxjj

Vendor Advisories for CVE-2026-66400(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 17× in last 7d / 81× 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 01:41 UTCEG score recompute
  2. 2026-08-27 01:41 UTCGHSA enrichment
  3. 2026-08-26 14:47 UTCEPSS rescore
  4. 2026-08-25 23:27 UTCEG score recompute
  5. 2026-08-25 23:27 UTCGHSA enrichment
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 20:38 UTCEG score recompute
  8. 2026-08-24 20:38 UTCGHSA enrichment
  9. 2026-08-23 18:24 UTCEG score recompute
  10. 2026-08-23 18:24 UTCGHSA enrichment
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-22 16:10 UTCEG score recompute
  13. 2026-08-22 16:10 UTCGHSA enrichment
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 13:56 UTCEG score recompute
  16. 2026-08-21 13:56 UTCGHSA enrichment
  17. 2026-08-20 22:56 UTCEPSS rescore
  18. 2026-08-20 11:20 UTCEG score recompute
  19. 2026-08-20 11:20 UTCGHSA enrichment
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-19 09:07 UTCEG score recompute
  22. 2026-08-19 09:07 UTCGHSA enrichment
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-18 06:50 UTCEG score recompute
  25. 2026-08-18 06:50 UTCGHSA enrichment
Show 56 more
  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-17 04:32 UTCEG score recompute
  3. 2026-08-17 04:32 UTCGHSA enrichment
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 02:18 UTCEG score recompute
  6. 2026-08-16 02:18 UTCGHSA enrichment
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-15 00:04 UTCEG score recompute
  9. 2026-08-15 00:04 UTCGHSA enrichment
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-13 21:50 UTCGHSA enrichment
  12. 2026-08-12 19:37 UTCEG score recompute
  13. 2026-08-12 19:37 UTCGHSA enrichment
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-11 17:23 UTCEG score recompute
  16. 2026-08-11 17:23 UTCGHSA enrichment
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 15:06 UTCEG score recompute
  19. 2026-08-10 15:06 UTCGHSA enrichment
  20. 2026-08-09 13:47 UTCEPSS rescore
  21. 2026-08-09 12:52 UTCEG score recompute
  22. 2026-08-09 12:52 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 10:37 UTCEG score recompute
  25. 2026-08-08 10:37 UTCGHSA enrichment
  26. 2026-08-07 08:23 UTCEG score recompute
  27. 2026-08-07 08:23 UTCGHSA enrichment
  28. 2026-08-06 13:47 UTCEPSS rescore
  29. 2026-08-06 06:09 UTCEG score recompute
  30. 2026-08-06 06:09 UTCGHSA enrichment
  31. 2026-08-05 19:17 UTCEPSS rescore
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 03:55 UTCEG score recompute
  34. 2026-08-05 03:55 UTCGHSA enrichment
  35. 2026-08-04 15:10 UTCEPSS rescore
  36. 2026-08-04 10:39 UTCEPSS rescore
  37. 2026-08-04 01:42 UTCEG score recompute
  38. 2026-08-04 01:42 UTCGHSA enrichment
  39. 2026-08-03 10:36 UTCEPSS rescore
  40. 2026-08-02 23:28 UTCEG score recompute
  41. 2026-08-02 23:28 UTCGHSA enrichment
  42. 2026-08-02 02:27 UTCEPSS rescore
  43. 2026-08-01 21:13 UTCEG score recompute
  44. 2026-08-01 21:13 UTCGHSA enrichment
  45. 2026-08-01 04:16 UTCEPSS rescore
  46. 2026-07-31 18:59 UTCGHSA enrichment
  47. 2026-07-30 16:45 UTCEG score recompute
  48. 2026-07-30 16:44 UTCGHSA enrichment
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-29 16:25 UTCEG score recompute
  51. 2026-07-29 16:25 UTCGHSA enrichment
  52. 2026-07-29 15:33 UTCEG score recompute
  53. 2026-07-29 15:33 UTCGHSA enrichment
  54. 2026-07-29 14:19 UTCEG score recompute
  55. 2026-07-29 13:58 UTCEG score recompute
  56. 2026-07-29 13:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66400?
CVE-2026-66400 is a medium vulnerability published on July 29, 2026. Grav Login Plugin versions before 3.8.13 contain an insufficient session expiration vulnerability in TokenStorage.php where the findTriplet() method fails to properly validate Remember Me token timestamps. Attackers with a captured Remember Me cookie can authenticate indefinitely instead of the…
When was CVE-2026-66400 disclosed?
CVE-2026-66400 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66400 actively exploited?
CVE-2026-66400 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 95.3% of all scored CVEs.
What is the CVSS score of CVE-2026-66400?
CVE-2026-66400 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-66400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66400, 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

Explore the affected products and dependency analysis for CVE-2026-66400

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