CVE-2026-44551 json
Open WebUI: LDAP Empty Password Authentication Bypass
published 2026-05-08 6 mo ago modified 2026-07-13 3 mo ago also GHSA-2r4p-jpmg-48f4 , PYSEC-2026-435 , EUVD-2026-30604
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 73%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- pypi open-webui 0.9.0
- openwebui open_webui 0.9.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
1.46% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Open WebUI 'LDAP Empty Password' - Authentication Bypass nuclei detection template
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| OSV | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | <0.9.0 |
0.9.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44551
advisory
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-2r4p-jpmg-48f4
advisory
Sources
- CVE List CVE-2026-44551
- GitHub Advisory GHSA-2r4p-jpmg-48f4
- NVD CVE-2026-44551
- OSV PYSEC-2026-435
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