CVE-2026-66005

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

Score 6.3 from GitHub Security Advisory published 2026-07-24. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

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

Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

July 24, 2026

Last Modified

July 30, 2026

Advisory Details (4)

Auto-updated Jul 24, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding | Advisories | VulnCheck

https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding
github_pr

fix: enforce Trusted Hosts allowlist when binding 0.0.0.0 (GHSA-x6p8-7cp8-c3p6)

Fix merged in janhq/jan PR #8506 on 2026-07-24 — awaiting tagged release

https://github.com/janhq/jan/pull/8506
generic

Issue · GitHub

https://github.com/janhq/jan/issues/8453
github_commit

commit 3e1c1e724f69 (janhq/jan)

Fix landed in janhq/jan commit 3e1c1e724f69 — awaiting tagged release

https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757

Vendor Advisories for CVE-2026-66005(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 68× 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 136 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66005?
CVE-2026-66005 is a medium vulnerability published on July 24, 2026. Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects…
When was CVE-2026-66005 disclosed?
CVE-2026-66005 was first published in the National Vulnerability Database on July 24, 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-2026-66005 actively exploited?
CVE-2026-66005 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 90.3% of all scored CVEs.
What is the CVSS score of CVE-2026-66005?
CVE-2026-66005 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-66005?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66005, 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.

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