Quick answers
- Is CVE-2026-109284 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109284 being exploited in the wild.
- How severe is CVE-2026-109284?
- Medium severity, with a CVSS score of 4.3, published 12 October 2026.
- Which products and versions are affected?
- Open WebUI 0.11.0 before 0.11.4.
- Is there a fix for CVE-2026-109284?
- Yes: fixed in 0.11.4. Until then: Upgrade to version 0.11.4, which adds write access validation to the fork endpoint. No configuration changes are required and downgrading users' access to shared folders will then be enforced completely. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109284 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-109284?
- 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
Upgrade to version 0.11.4, which adds write access validation to the fork endpoint. No configuration changes are required and downgrading users' access to shared folders will then be enforced completely.
Technical details
An improper authorization vulnerability exists in the POST /api/v1/chats/{id}/fork endpoint where the chat fork handler copies the source chat's folder assignment without validating the caller's current write access to that folder. An authenticated user with a shared folder downgraded from write to read-only can fork previously-created chats to re-add them to the folder, bypassing the write access checks enforced on direct chat creation and moves.
Affected products
- Open WebUI Open WebUI 0.11.0 before 0.11.4
Timeline
- 2026-09-27: disclosed
- 2026-10-12: advisory
- 2026-09-27: patched: Fixed in 0.11.4