CVE-2026-54007 — 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-2026-54007HIGH

open-webui open-webui — Open WebUI: Cross-origin postMessage confirmation bypass via action:submit

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   N   H   N    7.1   .0018    7.3     —

AFFECTED
  Product     Versions   Fixed
  open-webui  < 0.9.6 –  —

TIMELINE
  Jun 11  Reserved by GitHub_M
  Jun 23  EXPLOIT PUBLISHED — CVE-2026-54007 (open-webui). Public exploit reference added.
  Jun 23  Published (CNA: GitHub_M)

CWE-346 · CNA: GitHub_M · CVSS v4.0 · 1 reference · NVD status: Modified

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, the chat message listener allows non-same-origin input:prompt and action:submit messages, so an external site can set prompt text and trigger submitPrompt() in an authenticated victim session. I validated this with a cross-origin attacker page that auto-posted messages and caused unauthorized POST /api/v1/chats/new and POST /api/chat/completions requests containing attacker-controlled prompts. This enables cross-site forced actions and model/tool execution under victim privileges without consent. This vulnerability is fixed in 0.9.6.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 11, 2026	Reserved	Reserved by GitHub_M
June 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-54007 (open-webui). Public exploit reference added.
June 23, 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	—

Weaknesses

CWE-346

References (1)

https://github.com/open-webui/open-webui/security/advisories/GHSA-3vv5-8xxp-4f55 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-54007 at cve.org

Vendors: open-webui

Weaknesses: CWE-346

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54007 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.