CVE-2026-66477

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-27. 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: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

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

Unauthenticated Broken Access Control in Gillion <= 4.13 versions.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 27, 2026

Last Modified

July 27, 2026

References (1)

Vendor Advisories for CVE-2026-66477(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 / 59× 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 157 total refreshes for this CVE.

  1. 2026-09-29 07:54 UTCEG score recompute
  2. 2026-09-29 07:54 UTCGHSA enrichment
  3. 2026-09-28 13:52 UTCEPSS rescore
  4. 2026-09-28 03:57 UTCEG score recompute
  5. 2026-09-28 03:57 UTCGHSA enrichment
  6. 2026-09-26 15:59 UTCEPSS rescore
  7. 2026-09-25 06:55 UTCEG score recompute
  8. 2026-09-25 06:55 UTCGHSA enrichment
  9. 2026-09-23 22:03 UTCEG score recompute
  10. 2026-09-23 22:03 UTCGHSA enrichment
  11. 2026-09-23 17:54 UTCEPSS rescore
  12. 2026-09-22 21:49 UTCEG score recompute
  13. 2026-09-22 21:49 UTCGHSA enrichment
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-19 08:17 UTCEG score recompute
  16. 2026-09-19 08:17 UTCGHSA enrichment
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-18 09:10 UTCEG score recompute
  19. 2026-09-18 09:10 UTCGHSA enrichment
  20. 2026-09-17 10:31 UTCEG score recompute
  21. 2026-09-17 10:31 UTCGHSA enrichment
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 11:53 UTCEG score recompute
  24. 2026-09-16 11:53 UTCGHSA enrichment
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-15 09:10 UTCEG score recompute
  2. 2026-09-15 09:10 UTCGHSA enrichment
  3. 2026-09-14 02:52 UTCEG score recompute
  4. 2026-09-14 02:52 UTCGHSA enrichment
  5. 2026-09-13 04:15 UTCEG score recompute
  6. 2026-09-13 04:15 UTCGHSA enrichment
  7. 2026-09-12 05:38 UTCEG score recompute
  8. 2026-09-12 05:38 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:37 UTCEPSS rescore
  11. 2026-09-11 07:01 UTCEG score recompute
  12. 2026-09-11 07:01 UTCGHSA enrichment
  13. 2026-09-10 08:16 UTCGHSA enrichment
  14. 2026-09-09 08:21 UTCEG score recompute
  15. 2026-09-09 08:21 UTCGHSA enrichment
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-07 21:03 UTCEG score recompute
  18. 2026-09-07 21:03 UTCGHSA enrichment
  19. 2026-09-07 16:01 UTCEPSS rescore
  20. 2026-09-06 17:52 UTCEG score recompute
  21. 2026-09-06 17:52 UTCGHSA enrichment
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-05 19:15 UTCEG score recompute
  24. 2026-09-05 19:15 UTCGHSA enrichment
  25. 2026-09-05 15:31 UTCEPSS rescore
  26. 2026-09-04 12:32 UTCEG score recompute
  27. 2026-09-04 12:32 UTCGHSA enrichment
  28. 2026-09-04 05:07 UTCEPSS rescore
  29. 2026-09-02 14:12 UTCEPSS rescore
  30. 2026-09-01 22:59 UTCEG score recompute
  31. 2026-09-01 22:59 UTCGHSA enrichment
  32. 2026-09-01 13:54 UTCEPSS rescore
  33. 2026-08-30 22:29 UTCEG score recompute
  34. 2026-08-30 22:29 UTCGHSA enrichment
  35. 2026-08-30 19:17 UTCEPSS rescore
  36. 2026-08-30 01:22 UTCEPSS rescore
  37. 2026-08-29 23:52 UTCEG score recompute
  38. 2026-08-29 23:52 UTCGHSA enrichment
  39. 2026-08-28 21:42 UTCEPSS rescore
  40. 2026-08-27 21:00 UTCEG score recompute
  41. 2026-08-27 21:00 UTCGHSA enrichment
  42. 2026-08-26 22:18 UTCEG score recompute
  43. 2026-08-26 22:18 UTCGHSA enrichment
  44. 2026-08-26 14:47 UTCEPSS rescore
  45. 2026-08-25 23:40 UTCEG score recompute
  46. 2026-08-25 23:39 UTCGHSA enrichment
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-25 01:03 UTCEG score recompute
  49. 2026-08-25 01:03 UTCGHSA enrichment
  50. 2026-08-24 02:26 UTCGHSA enrichment
  51. 2026-08-23 03:35 UTCEG score recompute
  52. 2026-08-23 03:35 UTCGHSA enrichment
  53. 2026-08-23 00:19 UTCEPSS rescore
  54. 2026-08-22 04:58 UTCEG score recompute
  55. 2026-08-22 04:58 UTCGHSA enrichment
  56. 2026-08-21 23:49 UTCEPSS rescore
  57. 2026-08-21 06:21 UTCEG score recompute
  58. 2026-08-21 06:21 UTCGHSA enrichment
  59. 2026-08-20 22:56 UTCEPSS rescore
  60. 2026-08-20 07:44 UTCEG score recompute
  61. 2026-08-20 07:44 UTCGHSA enrichment
  62. 2026-08-19 17:04 UTCEPSS rescore
  63. 2026-08-19 09:07 UTCEG score recompute
  64. 2026-08-19 09:07 UTCGHSA enrichment
  65. 2026-08-18 13:48 UTCEPSS rescore
  66. 2026-08-18 10:24 UTCEG score recompute
  67. 2026-08-18 10:24 UTCGHSA enrichment
  68. 2026-08-17 13:47 UTCEPSS rescore
  69. 2026-08-17 11:45 UTCEG score recompute
  70. 2026-08-17 11:45 UTCGHSA enrichment
  71. 2026-08-16 14:56 UTCEPSS rescore
  72. 2026-08-16 13:04 UTCEG score recompute
  73. 2026-08-16 13:04 UTCGHSA enrichment
  74. 2026-08-15 14:28 UTCEG score recompute
  75. 2026-08-15 14:28 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-66477?
CVE-2026-66477 is a medium vulnerability published on July 27, 2026. Unauthenticated Broken Access Control in Gillion <= 4.13 versions.
When was CVE-2026-66477 disclosed?
CVE-2026-66477 was first published on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66477 actively exploited?
CVE-2026-66477 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66477?
CVE-2026-66477 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66477?
No fix for CVE-2026-66477 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-66477 are linked in the Vendor Advisories panel on this page.

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