Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user can permanently delete files owned by other users via DELETE /api/v1/files/{id} when the target file is referenced in any shared chat. The has_access_to_file() authorization gate unconditionally grants access through its shared-chat branch. It checks neither the requesting user's identity nor the type of operation being performed. File UUIDs (which would otherwise be impractical to guess) are disclosed to any user with read access to a knowledge base via GET /api/v1/knowledge/{id}/files. This vulnerability is fixed in 0.9.0.
CVE-2026-45671
HIGHNVD 8.08.0—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.0 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.0
- CVSS v3
- 8.0
- EG Score
- 8.0(medium)
- EPSS
- 14.2%
- KEV
- Not listed
Published
May 15, 2026
Last Modified
May 19, 2026
References (2)
- security-advisories@githubhttps://github.com/open-webui/open-webui/security/advisories/GHSA-26g9-27vm-x3q8
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/open-webui/open-webui/security/advisories/GHSA-26g9-27vm-x3q8
Frequently asked(5)
What is CVE-2026-45671?
CVE-2026-45671 is a high vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user can permanently delete files owned by other users via DELETE /api/v1/files/{id} when the target file is referenced in any shared chat. The hasaccessto_file()…
When was CVE-2026-45671 disclosed?
CVE-2026-45671 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45671 actively exploited?
CVE-2026-45671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45671?
CVE-2026-45671 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2026-45671?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45671, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45671
Is Your Infrastructure Affected by CVE-2026-45671?
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