{"id":"CVE-2026-70494","published":"2026-08-04T21:16:38.470","lastModified":"2026-08-05T15:17:12.630","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, the DELETE /api/v1/folders/{id} handler in backend/open_webui/routers/folders.py allowed a user granted write access to a shared chat folder to permanently delete chats and messages belonging to the folder owner. The cascade following the authorization check is bound to the folder owner's id, but the subfolder check accepted any inherited write grant instead of requiring ownership or administrator status. A collaborator can destroy the owner's subtree or force-move chats out of it when delete_contents=false. This issue is fixed in 0.11.0.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cwes":["CWE-862","CWE-863"],"vendors":[],"products":[],"references":[{"url":"https://github.com/open-webui/open-webui/commit/915ef7d0798d3175819cedbb2f62d7bf0db78c98","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/27003","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3cg5-48j3-v4gv","tags":[]}],"exploitRefs":[{"url":"https://github.com/open-webui/open-webui/commit/915ef7d0798d3175819cedbb2f62d7bf0db78c98","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/27003","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3cg5-48j3-v4gv","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows a user with write access to a shared chat folder to delete chats and messages belonging to the folder owner, potentially leading to data loss.","exploitability":"Exploitation requires write access to a shared chat folder; preconditions include having such access or being part of the shared group.","blast_radius":"If exploited, this could result in significant data loss for the folder owner, impacting communication and collaboration within the platform.","remediation":"Upgrade to version 0.11.0 or later to apply the necessary fix.","tags":["data-loss","web","auth-bypass","self-hosted"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-08-11T06:50:00.833Z"}}