CVE-2026-56400

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Elevated riskExposed: 0

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

open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
59(Track*)
EG Risk 59/100SSVC: 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
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 16, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

GitHub Security Lab (GHSL) Vulnerability Report, open-webui: GHSL-2024-174, GHSL-2024-175 · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wm
generic

open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/open-webui-remote-code-execution-via-cors-misconfiguration-and-session-validation

Vendor Advisories for CVE-2026-56400(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
open-webui0.1.124 ... 0.3.9 (51 versions)0.3.33—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 106× 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 318 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56400?
CVE-2026-56400 is a critical vulnerability published on July 15, 2026. open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests…
When was CVE-2026-56400 disclosed?
CVE-2026-56400 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56400 actively exploited?
CVE-2026-56400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.9% of all scored CVEs.
What is the CVSS score of CVE-2026-56400?
CVE-2026-56400 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-56400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56400, 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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