CVE-2026-44556

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

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

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the /responses endpoint in the OpenAI router accepts any authenticated user and forwards requests directly to upstream LLM providers without enforcing per-model access control. While the primary chat completion endpoint (generate_chat_completion) checks model ownership, group membership, and AccessGrants before allowing a request, the /responses proxy only validates that the user has a valid session via get_verified_user. This allows any authenticated user to interact with any model configured on the instance by sending a POST request to /api/openai/responses with an arbitrary model ID. This vulnerability is fixed in 0.9.0.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
22.5%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 19, 2026

Advisory Details (1)

Auto-updated May 18, 2026
Patch available. Sources: github.
github Patch Available

responses passthrough endpoint lacks access control authorization · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-hp5m-24vp-vq2q

Vendor Advisories for CVE-2026-44556(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 ... 0.8.9 (151 versions)0.9.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 48× 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 105 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-44556?
CVE-2026-44556 is a high vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the /responses endpoint in the OpenAI router accepts any authenticated user and forwards requests directly to upstream LLM providers without enforcing per-model access control. While…
When was CVE-2026-44556 disclosed?
CVE-2026-44556 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44556 actively exploited?
CVE-2026-44556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44556?
CVE-2026-44556 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-44556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44556, 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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