CVE-2026-66400

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM 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(medium)
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 13× in last 7d / 65× 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.

Showing the most recent 100 of 129 total refreshes for this CVE.

  1. 2026-09-19 04:55 UTCEG score recompute
  2. 2026-09-19 04:55 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 01:43 UTCEG score recompute
  5. 2026-09-18 01:43 UTCGHSA enrichment
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 11:49 UTCEG score recompute
  8. 2026-09-16 11:49 UTCGHSA enrichment
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 08:08 UTCEG score recompute
  11. 2026-09-15 08:08 UTCGHSA enrichment
  12. 2026-09-13 19:53 UTCEG score recompute
  13. 2026-09-13 19:53 UTCGHSA enrichment
  14. 2026-09-12 17:21 UTCGHSA enrichment
  15. 2026-09-11 15:06 UTCEG score recompute
  16. 2026-09-11 15:06 UTCGHSA enrichment
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-11 09:37 UTCEPSS rescore
  19. 2026-09-10 10:11 UTCEG score recompute
  20. 2026-09-10 10:11 UTCGHSA enrichment
  21. 2026-09-09 07:50 UTCEG score recompute
  22. 2026-09-09 07:50 UTCGHSA enrichment
  23. 2026-09-08 22:01 UTCEPSS rescore
  24. 2026-09-08 00:55 UTCEG score recompute
  25. 2026-09-08 00:55 UTCGHSA enrichment
Show 75 more
  1. 2026-09-07 16:01 UTCEPSS rescore
  2. 2026-09-06 22:41 UTCEG score recompute
  3. 2026-09-06 22:41 UTCGHSA enrichment
  4. 2026-09-06 13:47 UTCEPSS rescore
  5. 2026-09-05 19:07 UTCEG score recompute
  6. 2026-09-05 19:07 UTCGHSA enrichment
  7. 2026-09-05 15:31 UTCEPSS rescore
  8. 2026-09-04 11:56 UTCEG score recompute
  9. 2026-09-04 11:56 UTCGHSA enrichment
  10. 2026-09-04 05:07 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 22:47 UTCEG score recompute
  13. 2026-09-01 22:47 UTCGHSA enrichment
  14. 2026-09-01 13:54 UTCEPSS rescore
  15. 2026-08-31 01:34 UTCEG score recompute
  16. 2026-08-31 01:34 UTCGHSA enrichment
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-29 23:20 UTCEG score recompute
  20. 2026-08-29 23:20 UTCGHSA enrichment
  21. 2026-08-28 21:42 UTCEPSS rescore
  22. 2026-08-28 04:11 UTCEG score recompute
  23. 2026-08-28 04:11 UTCGHSA enrichment
  24. 2026-08-27 01:41 UTCEG score recompute
  25. 2026-08-27 01:41 UTCGHSA enrichment
  26. 2026-08-26 14:47 UTCEPSS rescore
  27. 2026-08-25 23:27 UTCEG score recompute
  28. 2026-08-25 23:27 UTCGHSA enrichment
  29. 2026-08-25 13:49 UTCEPSS rescore
  30. 2026-08-24 20:38 UTCEG score recompute
  31. 2026-08-24 20:38 UTCGHSA enrichment
  32. 2026-08-23 18:24 UTCEG score recompute
  33. 2026-08-23 18:24 UTCGHSA enrichment
  34. 2026-08-23 00:19 UTCEPSS rescore
  35. 2026-08-22 16:10 UTCEG score recompute
  36. 2026-08-22 16:10 UTCGHSA enrichment
  37. 2026-08-21 23:49 UTCEPSS rescore
  38. 2026-08-21 13:56 UTCEG score recompute
  39. 2026-08-21 13:56 UTCGHSA enrichment
  40. 2026-08-20 22:56 UTCEPSS rescore
  41. 2026-08-20 11:20 UTCEG score recompute
  42. 2026-08-20 11:20 UTCGHSA enrichment
  43. 2026-08-19 17:04 UTCEPSS rescore
  44. 2026-08-19 09:07 UTCEG score recompute
  45. 2026-08-19 09:07 UTCGHSA enrichment
  46. 2026-08-18 13:48 UTCEPSS rescore
  47. 2026-08-18 06:50 UTCEG score recompute
  48. 2026-08-18 06:50 UTCGHSA enrichment
  49. 2026-08-17 13:47 UTCEPSS rescore
  50. 2026-08-17 04:32 UTCEG score recompute
  51. 2026-08-17 04:32 UTCGHSA enrichment
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 02:18 UTCEG score recompute
  54. 2026-08-16 02:18 UTCGHSA enrichment
  55. 2026-08-15 01:30 UTCEPSS rescore
  56. 2026-08-15 00:04 UTCEG score recompute
  57. 2026-08-15 00:04 UTCGHSA enrichment
  58. 2026-08-13 22:00 UTCEPSS rescore
  59. 2026-08-13 21:50 UTCGHSA enrichment
  60. 2026-08-12 19:37 UTCEG score recompute
  61. 2026-08-12 19:37 UTCGHSA enrichment
  62. 2026-08-12 13:51 UTCEPSS rescore
  63. 2026-08-11 17:23 UTCEG score recompute
  64. 2026-08-11 17:23 UTCGHSA enrichment
  65. 2026-08-11 00:00 UTCEPSS rescore
  66. 2026-08-10 15:06 UTCEG score recompute
  67. 2026-08-10 15:06 UTCGHSA enrichment
  68. 2026-08-09 13:47 UTCEPSS rescore
  69. 2026-08-09 12:52 UTCEG score recompute
  70. 2026-08-09 12:52 UTCGHSA enrichment
  71. 2026-08-08 16:37 UTCEPSS rescore
  72. 2026-08-08 10:37 UTCEG score recompute
  73. 2026-08-08 10:37 UTCGHSA enrichment
  74. 2026-08-07 08:23 UTCEG score recompute
  75. 2026-08-07 08:23 UTCGHSA enrichment

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

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