CVE-2026-44551

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 1.6% (75th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.1CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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 (value × EchelonGraph’s weight)
Severity91% × 45%
The EG Score, 9.1 of 10.
Exploitation1.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.6%
EPSS %ILE
75th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated Aug 1, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

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 rangeFix by version rangeDependents
open-webui0.1.124 ... 0.8.9 (151 versions)
  • every version up to 0.9.0: fixed in 0.9.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 167 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 68 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:47 UTCEG score recompute
  2. 2026-10-11 17:01 UTCEG score recompute
  3. 2026-10-11 14:27 UTCEG score recompute
  4. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  12. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  15. 2026-09-30 13:32 UTCOSV refresh
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  18. 2026-09-23 17:53 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  21. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
Show 74 more
  1. 2026-09-11 20:40 UTCOSV refresh
  2. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  3. 2026-09-11 09:37 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  4. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  5. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  6. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  7. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  8. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  9. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  10. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  11. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  12. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  13. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  14. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  15. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  16. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  17. 2026-08-23 17:26 UTCEG score recompute
  18. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  19. 2026-08-22 01:19 UTCEG score recompute
  20. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  21. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  22. 2026-08-20 19:23 UTCEG score recompute
  23. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  24. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  25. 2026-08-17 13:55 UTCEG score recompute
  26. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  27. 2026-08-17 10:15 UTCEG score recompute
  28. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  29. 2026-08-16 03:48 UTCEG score recompute
  30. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  31. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  32. 2026-08-14 02:17 UTCEG score recompute
  33. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  34. 2026-08-12 14:51 UTCEG score recompute
  35. 2026-08-12 13:51 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  36. 2026-08-11 13:59 UTCEG score recompute
  37. 2026-08-11 00:47 UTCEG score recompute
  38. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  39. 2026-08-09 16:25 UTCEG score recompute
  40. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  41. 2026-08-09 01:45 UTCEG score recompute
  42. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  43. 2026-08-07 17:49 UTCEG score recompute
  44. 2026-08-06 16:47 UTCEG score recompute
  45. 2026-08-06 13:46 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  46. 2026-08-05 21:29 UTCEG score recompute
  47. 2026-08-05 19:17 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  48. 2026-08-04 15:10 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  49. 2026-08-04 10:38 UTCEPSS rescoreEPSS 1.5% · 71st percentile
  50. 2026-08-03 18:55 UTCEG score recompute
  51. 2026-08-03 10:36 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  52. 2026-08-02 05:56 UTCEG score recompute
  53. 2026-08-02 02:27 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  54. 2026-08-01 18:52 UTCEG score recompute
  55. 2026-08-01 04:16 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  56. 2026-07-30 16:28 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  57. 2026-07-30 01:30 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  58. 2026-07-28 15:36 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  59. 2026-07-27 14:13 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  60. 2026-07-26 14:54 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  61. 2026-07-25 14:18 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  62. 2026-07-24 14:17 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  63. 2026-07-23 14:18 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  64. 2026-07-23 03:15 UTCEG score recompute
  65. 2026-07-22 14:08 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  66. 2026-07-21 15:24 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  67. 2026-07-20 17:08 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  68. 2026-07-19 14:31 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  69. 2026-07-19 02:29 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  70. 2026-07-18 10:04 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  71. 2026-07-18 00:59 UTCOSV refresh
  72. 2026-07-16 17:03 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  73. 2026-07-15 16:57 UTCEPSS rescoreEPSS 1.5% · 70th percentile
  74. 2026-07-15 02:00 UTCEPSS rescoreEPSS 1.5% · 70th percentile

Public detection templates

(1 reference)

A public Nuclei detection template is referenced for this CVE. A detection template checks whether a system is affected; it is not necessarily exploit code.

  • Nucleihttp/cves/2026/CVE-2026-44551.yaml
    Published Jun 4, 2026

    Open WebUI 'LDAP Empty Password' - Authentication Bypass

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-44551?
CVE-2026-44551 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-44551 published?
The CVE record for CVE-2026-44551 was published on May 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 18, 2026; the record at its source may have been updated since.
Is CVE-2026-44551 actively exploited?
CVE-2026-44551 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-44551 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-44551 are linked in the Vendor Advisories panel on this page.

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