CVE-2026-59221 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-59221HIGH

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  C  H  N  N    7.7   .0036   29.4     —

AFFECTED
  Product     Versions              Fixed
  open-webui  >= 0.9.6, < 0.10.0 –  —

TIMELINE
  Jul 2   Reserved by GitHub_M
  Jul 9   EXPLOIT PUBLISHED — CVE-2026-59221 (open-webui). Public exploit reference added.
  Jul 9   Published (CNA: GitHub_M)

CWE-22, CWE-918 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 2, 2026	Reserved	Reserved by GitHub_M
July 9, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59221 (open-webui). Public exploit reference added.
July 9, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.9.6, < 0.10.0	—

Weaknesses

CWE-22 · CWE-918

References (4)

https://github.com/open-webui/open-webui/commit/05098d25a58d03738e01c4e85e8852c3b4ad849c [Patch]
https://github.com/open-webui/open-webui/pull/26050 [Issue Tracking, Patch]
https://github.com/open-webui/open-webui/releases/tag/v0.10.0 [Product, Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-59221 at cve.org

Vendors: open-webui

Weaknesses: CWE-22 · CWE-918

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59221 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.