CVE-2026-44558 — Open WebUI is a self-hosted artificial intelligence
CVE-2026-44558 — Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the channel router does not call filter_allowed_access_grants on either create or update paths. A non-admin user who can create group channels (or who owns a channel) c
What This Means For You
- If your environment is affected by CWE-862, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-44558 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-44558 - Open WebUI Unauthorized Access Grant Creation
title: CVE-2026-44558 - Open WebUI Unauthorized Access Grant Creation
id: scw-2026-05-15-ai-1
status: experimental
level: high
description: |
Detects the creation of arbitrary access grants via the '/api/channels/grants' endpoint in Open WebUI versions prior to 0.9.0. This specific API path and method, when successful (indicated by a 200 status code), directly correlates with the vulnerability where non-admin users can submit public wildcard grants, bypassing permission frameworks. This rule targets the core exploitation vector of CVE-2026-44558.
author: SCW Feed Engine (AI-generated)
date: 2026-05-15
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44558/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/api/channels/grants'
cs-method:
- 'POST'
sc-status:
- '200'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44558 | vulnerability | CVE-2026-44558 |
| CWE-862 | weakness | CWE-862 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 15, 2026 at 23:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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