Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-70491

CVE-2026-70491MEDIUM

open-webui open-webui — Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  N  N    6.5   .0048   39.1     —

AFFECTED
  Product     Versions    Fixed
  open-webui  < 0.11.0 –  —

TIMELINE
  Aug 4   Reserved by GitHub_M
  Aug 4   Published (CNA: GitHub_M)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-70491 (open-webui). Public exploit reference added.

CWE-200 · 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. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dump into the response, re-admitting omitted fields. A non-admin with a read grant can obtain another user's server-side tool source, which commonly embeds hard-coded API keys, credentials, and internal service URLs. This issue is fixed in 0.11.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 4, 2026	Reserved	Reserved by GitHub_M
August 4, 2026	Published	Published (CNA: GitHub_M)
September 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-70491 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	< 0.11.0	—

Weaknesses

CWE-200

References (4)

https://github.com/open-webui/open-webui/commit/c05de13b4fca1ac8a17153782b46b3d0aacf491c [Patch]
https://github.com/open-webui/open-webui/pull/27005 [Patch, Vendor Advisory]
https://github.com/open-webui/open-webui/releases/tag/v0.11.0 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-3r7g-q6cg-q2vx [Exploit, Patch, Vendor Advisory]

Authoritative record: CVE-2026-70491 at cve.org

Vendors: open-webui

Weaknesses: CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-70491 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 Sunday, October 4, 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.