Is CVE-2026-109285 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109285 being exploited in the wild.

How severe is CVE-2026-109285?

Medium severity, with a CVSS score of 5, published 12 October 2026.

Is there a fix for CVE-2026-109285?

Yes: fixed in 0.11.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-109285 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-109285?

Check whether you run Open WebUI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-109285: Open WebUI improper access control in knowledge base file handling

CVE-2026-109285 · Severity: medium · CVSS 5 · Published 2026-10-12

Open WebUI is a platform for managing AI knowledge bases and file sharing. A flaw in access control allows former collaborators on shared knowledge bases to retain the ability to read or delete files even after the owner removes them, potentially exposing private files from the owner's personal knowledge bases. An attacker who previously had read or write permissions can exploit stale cached references to access files they should no longer be able to see.

Technologies: Open WebUI. Vendors: Open WebUI.

Quick answers

Is CVE-2026-109285 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109285 being exploited in the wild.
How severe is CVE-2026-109285?: Medium severity, with a CVSS score of 5, published 12 October 2026.
Which products and versions are affected?: Open WebUI 0.6.0 to 0.11.3.
Is there a fix for CVE-2026-109285?: Yes: fixed in 0.11.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109285 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-109285?: Check whether you run Open WebUI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.11.4

Technical details

The vulnerability exists in the has_access_to_file function, which checks access based on a cached knowledge base ID stored in the file's metadata rather than verifying current file-to-knowledge-base associations. Former collaborators with read or write grants can download or delete files via the file content and delete endpoints after the files are removed from the shared knowledge base. The issue only occurs when files remain attached to other knowledge bases or were reset in specific ways, and requires the attacker to have previously held valid grants and know the file ID.

Affected products

Open WebUI Open WebUI 0.6.0 to 0.11.3

Timeline

2026-09-27: disclosed
2026-10-12: advisory
2026: patched: Fixed in version 0.11.4

References

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