CVE-2026-44551

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 1.5%, top 30% 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
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: 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 authentication endpoint does not validate that the submitted password is non-empty before performing a Simple Bind against the LDAP server. The LdapForm Pydantic model accepts password: str with no minimum length constraint, so an empty string passes validation. The subsequent Connection.bind() call succeeds on vulnerable LDAP servers, and the application issues a full session token for the target user. This vulnerability is fixed in 0.9.0.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
70.5%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

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

LDAP Empty Password Authentication Bypass · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4

Vendor Advisories for CVE-2026-44551(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(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 72× 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 178 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
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-01 15:07 UTCEPSS rescore
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-29 21:25 UTCEG score recompute
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 12:32 UTCEG score recompute
  14. 2026-06-28 08:52 UTCEG score recompute
  15. 2026-06-28 05:09 UTCEG score recompute
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 01:29 UTCEG score recompute
  18. 2026-06-27 21:48 UTCEG score recompute
  19. 2026-06-27 12:53 UTCEG score recompute
  20. 2026-06-27 07:46 UTCEG score recompute
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-26 20:08 UTCEG score recompute
  23. 2026-06-26 03:53 UTCEG score recompute
  24. 2026-06-25 23:20 UTCEG score recompute
  25. 2026-06-25 18:43 UTCEG score recompute
Show 75 more
  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-25 13:49 UTCEPSS rescore
  3. 2026-06-24 14:05 UTCEPSS rescore
  4. 2026-06-23 21:33 UTCEPSS rescore
  5. 2026-06-22 14:25 UTCEPSS rescore
  6. 2026-06-22 14:25 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-21 14:56 UTCEPSS rescore
  9. 2026-06-21 01:59 UTCEPSS rescore
  10. 2026-06-19 19:25 UTCEPSS rescore
  11. 2026-06-18 17:52 UTCEPSS rescore
  12. 2026-06-18 17:52 UTCEPSS rescore
  13. 2026-06-18 03:52 UTCEG score recompute
  14. 2026-06-17 23:57 UTCEG score recompute
  15. 2026-06-17 20:15 UTCEG score recompute
  16. 2026-06-17 17:53 UTCEPSS rescore
  17. 2026-06-17 13:21 UTCEG score recompute
  18. 2026-06-17 05:11 UTCEG score recompute
  19. 2026-06-17 01:31 UTCEG score recompute
  20. 2026-06-16 21:50 UTCEG score recompute
  21. 2026-06-16 17:52 UTCEPSS rescore
  22. 2026-06-16 11:05 UTCEG score recompute
  23. 2026-06-16 06:51 UTCEG score recompute
  24. 2026-06-16 03:11 UTCEG score recompute
  25. 2026-06-15 23:29 UTCEG score recompute
  26. 2026-06-15 17:49 UTCEPSS rescore
  27. 2026-06-15 05:29 UTCEG score recompute
  28. 2026-06-15 01:48 UTCEG score recompute
  29. 2026-06-14 22:08 UTCEG score recompute
  30. 2026-06-14 18:27 UTCEG score recompute
  31. 2026-06-14 14:19 UTCEG score recompute
  32. 2026-06-14 10:21 UTCEG score recompute
  33. 2026-06-14 06:34 UTCEG score recompute
  34. 2026-06-14 02:53 UTCEG score recompute
  35. 2026-06-13 23:12 UTCEG score recompute
  36. 2026-06-13 23:00 UTCEPSS rescore
  37. 2026-06-13 15:09 UTCEG score recompute
  38. 2026-06-13 07:49 UTCEG score recompute
  39. 2026-06-13 03:59 UTCEG score recompute
  40. 2026-06-12 23:33 UTCEG score recompute
  41. 2026-06-12 23:12 UTCEPSS rescore
  42. 2026-06-12 23:12 UTCEPSS rescore
  43. 2026-06-12 19:52 UTCEG score recompute
  44. 2026-06-12 16:10 UTCEG score recompute
  45. 2026-06-12 12:04 UTCEG score recompute
  46. 2026-06-12 08:24 UTCEG score recompute
  47. 2026-06-12 04:43 UTCEG score recompute
  48. 2026-06-12 01:02 UTCEG score recompute
  49. 2026-06-11 21:22 UTCEG score recompute
  50. 2026-06-11 17:42 UTCEG score recompute
  51. 2026-06-11 14:01 UTCEG score recompute
  52. 2026-06-11 14:00 UTCEPSS rescore
  53. 2026-06-11 10:21 UTCEG score recompute
  54. 2026-06-11 06:39 UTCEG score recompute
  55. 2026-06-11 02:58 UTCEG score recompute
  56. 2026-06-10 23:18 UTCEG score recompute
  57. 2026-06-10 22:18 UTCEPSS rescore
  58. 2026-06-10 19:38 UTCEG score recompute
  59. 2026-06-10 15:58 UTCEG score recompute
  60. 2026-06-10 13:22 UTCEPSS rescore
  61. 2026-06-10 13:22 UTCEPSS rescore
  62. 2026-06-10 12:18 UTCEG score recompute
  63. 2026-06-10 08:38 UTCEG score recompute
  64. 2026-06-10 04:58 UTCEG score recompute
  65. 2026-06-10 01:18 UTCEG score recompute
  66. 2026-06-09 21:38 UTCEG score recompute
  67. 2026-06-09 17:46 UTCEG score recompute
  68. 2026-06-09 14:06 UTCEG score recompute
  69. 2026-06-09 10:26 UTCEG score recompute
  70. 2026-06-09 06:46 UTCEG score recompute
  71. 2026-06-09 03:06 UTCEG score recompute
  72. 2026-06-08 23:26 UTCEG score recompute
  73. 2026-06-08 19:45 UTCEG score recompute
  74. 2026-06-08 14:17 UTCEPSS rescore
  75. 2026-06-08 14:17 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-44551.yaml
    First seen Jan 1, 2026

    Open WebUI 'LDAP Empty Password' - Authentication Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44551?
CVE-2026-44551 is a critical 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 authentication endpoint does not validate that the submitted password is non-empty before performing a Simple Bind against the LDAP server. The LdapForm Pydantic model accepts…
When was CVE-2026-44551 disclosed?
CVE-2026-44551 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44551 actively exploited?
CVE-2026-44551 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44551?
CVE-2026-44551 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-44551?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44551, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44551

Explore →

Is Your Infrastructure Affected by CVE-2026-44551?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs