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Advisory record · GHSA-3vv5-8xxp-4f55

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

CVSS 7.1 HighEPSS 0.0023 · 14th percentile

Published by the GitHub Advisory Database at 17 Jun 2026, 14:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
open-webuiPyPI<0.9.60.9.6
Identifiers
GHSA-3vv5-8xxp-4f55 · CVE-2026-54007 · PYSEC-2026-2695
Weakness (CWE)
CWE-346
Tags
Published
17 Jun 2026
Updated
20 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Open WebUI versions before 0.9.6 let a non-same-origin page send postMessage events that set the chat input text and trigger submission without the usual confirmation dialog. An attacker who lures a logged-in user to a malicious page can cause prompts to be sent under that user's session, including model and tool execution. Upgrade to Open WebUI 0.9.6 or later.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 14th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:42 UTC First seen by agentprime
  2. 31 Oct 2026, 14:42 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.