CVE-2026-59221: open webui Path Traversal

Description

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.

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CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0036

Probability of exploitation

0.29%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
openwebui	open_webui	All

References

Advisories & Patches

https://github.com/open-webui/open-webui/commit/05098d25a58d03738e01c4e85e8852c3b4ad849c https://github.com/open-webui/open-webui/pull/26050 https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w

Exploits

https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w

Other References

https://github.com/open-webui/open-webui/releases/tag/v0.10.0

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-59221? +

CVE-2026-59221 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0036, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-59221? +

CVE-2026-59221 affects products from openwebui, specifically: open_webui. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-59221? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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