Path Traversal in Open-Webui
CVE-2026-59221
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 before 0.10.0, _sanitize_proxy_path in backend/open_webui/routers/terminals.py decoded proxy paths only eight times, allowing a nine-times percent-encoded ../ traversal value to pass normalization checks and be decoded by the upstream terminal server. This issue is fixed in version 0.10.0.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Open-webui — versions >= 0.9.6, < 0.10.0
- Openwebui Open_webui — versions 0.9.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-59221?
- CVE-2026-59221 is a high-severity vulnerability in Open-Webui, classified under Path Traversal. CVSS score: 7.7/10. Published 2026-07-09.
- How severe is CVE-2026-59221?
- High severity. CVSS v3 base score is 7.7 out of 10.