CVE-2026-45398
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affects the retrieval write endpoints (/process/text, /process/file, /process/files/batch, /process/web, /process/youtube), allowing an attacker to inject content into or overwrite another user's knowledge base. This vulnerability is fixed in 0.9.5.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.9.5 | 0.9.5 |
Affected products
2<= 0.9.4+ 1 more
- (no CPE)range: <= 0.9.4
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.5
Patches
Vulnerability mechanics
References
5- github.com/open-webui/open-webui/pull/22109nvdIssue TrackingPatchWEB
- github.com/open-webui/open-webui/security/advisories/GHSA-4g37-7p2c-38r9nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-4g37-7p2c-38r9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45398ghsaADVISORY
- github.com/open-webui/open-webui/releases/tag/v0.9.5nvdRelease NotesWEB
News mentions
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