---
title: "CVE-2026-44551: Open WebUI has an LDAP Empty Password Authentication Bypass"
url: https://erroneo.us/security/cve/CVE-2026-44551/
description: "CVE-2026-44551 (open-webui (PyPI)): Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-15
date_modified: 2026-05-19
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44551"
kev: false
cvss: 9.1
epss: 0.01634
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44551: Open WebUI has an LDAP Empty Password Authentication Bypass

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.6% , percentile 76: FIRST’s model estimates a 1.6% chance of exploitation activity in the next 30 days, higher than 76% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes open-webui (PyPI) <= 0.8.12, fixed in 0.9.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- PyPI `open-webui` <= 0.8.12 → fixed: 0.9.0

## Affected products (CVE record)

- open-webui open-webui: < 0.9.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.63% probability of exploitation activity in the next 30 days; percentile 76.

## Sources

- [GitHub Advisory GHSA-2r4p-jpmg-48f4](https://github.com/advisories/GHSA-2r4p-jpmg-48f4)
- [CVE.org record CVE-2026-44551](https://www.cve.org/CVERecord?id=CVE-2026-44551)
- [NVD entry CVE-2026-44551](https://nvd.nist.gov/vuln/detail/CVE-2026-44551)
- [github.com](https://github.com/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4)

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Source page: https://erroneo.us/security/cve/CVE-2026-44551/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt