CVE-2026-13323 — 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-2026-13323HIGH

Eclipse Foundation Eclipse Open VSX — In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   R  C  H  H  N    8.7   .0021   11.8     —

AFFECTED
  Product           Versions  Fixed
  Eclipse Open VSX  0.1.0 –   —

TIMELINE
  Jun 25  Reserved by eclipse
  Jul 1   EXPLOIT PUBLISHED — CVE-2026-13323 (Eclipse Foundation Eclipse Open VSX). Public exploit reference added.
  Jul 1   Published (CNA: eclipse)

CWE-79 · CNA: eclipse · CVSS v3.1 · 2 references · NVD status: Analyzed

Description

In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 25, 2026	Reserved	Reserved by eclipse
July 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-13323 (Eclipse Foundation Eclipse Open VSX). Public exploit reference added.
July 1, 2026	Published	Published (CNA: eclipse)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Eclipse Foundation	Eclipse Open VSX	—	0.1.0	—

Weaknesses

CWE-79

References (2)

https://github.com/eclipse-openvsx/openvsx/pull/1922 [Issue Tracking, Patch]
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 [Exploit, Issue Tracking, Vendor Advisory]

Authoritative record: CVE-2026-13323 at cve.org

Vendors: eclipse foundation

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-13323 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.