CVE-2026-28788
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline.
Published Mar 27, 2026 · updated Jun 17, 2026 · openwebui open webui
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via and then overwrite those files, escalating from read to write. The overwritten content is served to the LLM via RAG, meaning the attacker controls what the model tells other users. Version 0.8.6 patches the issue.
Code
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No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 27, 2026 · NIST NVD
Detected
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via and then overwrite those files, escalating from read to write.
Jun 17, 2026 · NIST NVD
Updated
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via and then overwrite those files, escalating from read to write.
Affected
- cpe openwebui/open webuiversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-28788
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-28788
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the endpoint. The endpoint performs no own
nvd.nist.gov