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-2026-87995

CVE-2026-87995HIGH

open-webui open-webui — Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   R  C  H  H  N    8.7   .0042   33.8     —

AFFECTED
  Product     Versions               Fixed
  open-webui  >= 0.8.11, < 0.11.1 –  —

TIMELINE
  Sep 9   Reserved by GitHub_M
  Sep 9   Published (CNA: GitHub_M)
  Sep 16  EXPLOIT PUBLISHED — CVE-2026-87995 (open-webui). Public exploit reference added.

CWE-79, CWE-1021 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by GitHub_M
September 9, 2026	Published	Published (CNA: GitHub_M)
September 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87995 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.8.11, < 0.11.1	—

Weaknesses

CWE-79 · CWE-1021

References (3)

https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0 [Patch]
https://github.com/open-webui/open-webui/releases/tag/v0.11.1 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-87995 at cve.org

Vendors: open-webui

Weaknesses: CWE-79 · CWE-1021

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87995 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.