CVE-2026-45675

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 73% 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, secondary
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: 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 LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py, line 663) was explicitly patched to prevent this race with the comment "Insert with default role first to avoid TOCTOU race", but the LDAP and OAuth code paths were never updated with the same fix. This vulnerability is fixed in 0.9.0.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
27.5%
KEV
Not listed

Published

May 15, 2026

Last Modified

June 18, 2026

Advisory Details (3)

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

LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3
generic

fix: prevent first-user admin race in LDAP and OAuth registration by Classic298 · Pull Request #23626 · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/pull/23626
generic

fix: prevent first-user admin race in LDAP and OAuth registration (#2… · open-webui/open-webui@96a0b32 · GitHub

https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ec

Vendor Advisories for CVE-2026-45675(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 6× in last 7d / 51× 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 108 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-45675?
CVE-2026-45675 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 LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py,…
When was CVE-2026-45675 disclosed?
CVE-2026-45675 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45675 actively exploited?
CVE-2026-45675 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45675?
CVE-2026-45675 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-45675?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45675, 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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