CVE-2026-54009 — 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-2026-54009MEDIUM

open-webui open-webui — Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  N  N    6.5   .0027   19.0     —

AFFECTED
  Product     Versions   Fixed
  open-webui  < 0.9.6 –  —

TIMELINE
  Jun 11  Reserved by GitHub_M
  Jun 23  EXPLOIT PUBLISHED — CVE-2026-54009 (open-webui). Public exploit reference added.
  Jun 23  Published (CNA: GitHub_M)

CWE-639 · CNA: GitHub_M · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, POST /api/chat/completions accepts an image_url.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. an authenticated user can therefore set image_url.url to another user's file id, the server reads that file from disk, base64-encodes it, and injects the data URI into the LLM request. the user then prompts the LLM to describe / OCR the file and reads the content back. 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-2026-54009 (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-639

References (1)

https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg [Exploit, Vendor Advisory, Mitigation]

Authoritative record: CVE-2026-54009 at cve.org

Vendors: open-webui

Weaknesses: CWE-639

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54009 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.