CVE-2026-66656

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Unauthenticated Local File Inclusion in Foton Core <= 1.1.1 versions.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

References (1)

Vendor Advisories for CVE-2026-66656(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 20× in last 7d / 96× 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 133 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66656?
CVE-2026-66656 is a high vulnerability published on August 13, 2026. Unauthenticated Local File Inclusion in Foton Core <= 1.1.1 versions.
When was CVE-2026-66656 disclosed?
CVE-2026-66656 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66656 actively exploited?
CVE-2026-66656 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 72.7% of all scored CVEs.
What is the CVSS score of CVE-2026-66656?
CVE-2026-66656 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-66656?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66656, 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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