{"id":"CVE-2026-87997","title":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform","summary":"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…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-639","CWE-862"],"vendor":"openwebui","product":"open_webui","affected":["open_webui >= 0.10.0, < 0.11.1"],"patched":["open_webui 0.11.1"],"published":"2026-09-09","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:14:39.770","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87997","references":[{"url":"https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/pull/28366","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.1","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00217,"epssPercentile":0.12349,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T13:43:57.477520Z"},"ingestedAt":"2026-09-14T15:23:07.420Z","slug":"CVE-2026-87997","body":"## Overview\n\nOpen 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.\n\n## Affected\n\n- `open_webui >= 0.10.0, < 0.11.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `open_webui 0.11.1`","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":200086,"id":"CVE-2026-87997","ts":1789395646780,"field":"exploit_available","old":"false","new":"true"}]}