Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59221open-webui terminal proxy path traversal guard bypass via 9x encoded traversal

High 7.7

In plain English

A high-severity path traversal in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.5%top 58.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.10.0	GHSA-frvj-c5qp-xj4w
PyPI	open-webui	0.10.0	PYSEC-2026-3597

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	>= 0.9.6, < 0.10.0

Weakness: CWE-22, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w x_refsource_CONFIRM
https://github.com/open-webui/open-webui/pull/26050 x_refsource_MISC
https://github.com/open-webui/open-webui/commit/05098d25a58d03738e01c4e85e8852c3b4ad849c x_refsource_MISC
https://github.com/open-webui/open-webui/releases/tag/v0.10.0 x_refsource_MISC