Authenticated member disclosure via omitted channel access check
Published May 15, 2026 · Updated May 15, 2026
Missing authorization in Open WebUI before 0.9.0 allows remote authenticated users to enumerate members of private standard channels. The GET /api/v1/channels/{id}/members handler skips channel_has_access for standard channels and returns IDs, names, emails, roles, and profile images. Exploitation requires the channels feature, which is disabled by default, and a known private-channel UUID; message contents remain protected.
Summary
What happened
Missing authorization in Open WebUI before 0.9.0 allows remote authenticated users to enumerate members of private standard channels. The GET /api/v1/channels/{id}/members handler skips channel_has_access for standard channels and returns IDs, names, emails, roles, and profile images. Exploitation requires the channels feature, which is disabled by default, and a known private-channel UUID; message contents remain protected.
The record
- CVE
- CVE-2026-44559
- Published
- May 15, 2026
- Updated
- May 15, 2026
- Vendor
- Open WebUI
- Product
- Open WebUI
- Classifications
- CWE-862, T1087
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 15, 2026CVE publishedPublication date reported by the CVE source.
- May 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.9.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-c7wp-3qh5-55pv attack scenarioproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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