# CVE-2026-87997

## Summary

- **CVE ID:** CVE-2026-87997
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-639, CWE-862
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/chat/completions and POST /api/v1/chat/completions in backend/open_webui/main.py copied a client-supplied folder_id into a new chat without applying the folder write-access check used by the dedicated chat routes. An authenticated user who knew a shared folder identifier could inject an attacker-controlled chat into a folder where the user had read-only or no write access, causing the entry to appear to authorized folder readers. This issue is fixed in version 0.11.1.

## Affected Products

- open-webui — open-webui (>= 0.10.0, < 0.11.1)

## References

- [CNA](https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28)
- [CNA](https://github.com/open-webui/open-webui/pull/28366)
- [CNA](https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c)
- [CNA](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._