open-webui terminal proxy path traversal guard bypass via 9x encoded traversal
Priority HIGH 67CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00483 41st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed open-webui (open-webui): 0.10.0open-webui (PyPI): 0.10.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| open-webui | open-webui | 0.9.6 to before 0.10.0 | 0.10.0 | Patch available | CNA |
| — | open-webui (PyPI) | 0.9.6 to before 0.10.0 | 0.10.0 | Patch available | GHSA-frvj-c5qp-xj4w |
- open-webui Vendoropen-webui Affected 0.9.6 to before 0.10.0 Fixed in 0.10.0 Patch available CNA
- open-webui (PyPI) Vendor— Affected 0.9.6 to before 0.10.0 Fixed in 0.10.0 Patch available GHSA-frvj-c5qp-xj4w
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openwebui:open_webui:0.9.6:*:*:*:*:*:*:* | 0.9.6 | Vulnerable | open-webui |
- cpe:2.3:a:openwebui:open_webui:0.9.6:*:*:*:*:*:*:* Versions 0.9.6 Vulnerable ·open-webui
Remediation
- Fix · CNA open-webui (open-webui) Fixed in 0.10.0
- Fix · GHSA-frvj-c5qp-xj4w open-webui (PyPI) Fixed in 0.10.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-59221
- 2026-10-03 Alias added: GHSA-frvj-c5qp-xj4w
References
Patch 2
More open-webui Open Webui vulnerabilities
- TI-2024-06216 Open WebUI Arbitrary File Upload + Path Traversal CVSS 3.1HIGH 8.8
- TI-2024-07467 Improper Authentication in open-webui/open-webui CVSS 3.1HIGH 8.2
- TI-2026-42359 Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id CVSS 3.1CRITICAL 9.0
- TI-2026-40759 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation CVSS 4.0CRITICAL 9.0
- TI-2024-07431 Cross-site Scripting (XSS) in open-webui/open-webui CVSS 3.0CRITICAL 9.0
- TI-2026-60021 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin CVSS 3.1HIGH 8.7
Sources
- CVE-2026-59221 · CVE Program
- CVE-2026-59221 · NVD
- FIRST EPSS
- GHSA-frvj-c5qp-xj4w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences