CVE-2026-13323
Open VSX Registry Uncontrolled Resource Consumption
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.
INFO
Published Date :
July 1, 2026, 12:16 p.m.
Last Modified :
July 6, 2026, 8:33 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | e51fbebd-6053-4e49-959f-1b94eeb69a2c | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Open VSX Registry to version 1.0.2.
- Ensure response headers include Content-Security-Policy.
- Implement Content-Disposition: attachment header.
- Review publisher account registrations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-13323.
| URL | Resource |
|---|---|
| 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 |
| https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 | Exploit Issue Tracking Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-13323 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-13323
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13323 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-13323 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:eclipse:open_vsx:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2 Added Reference Type Eclipse Foundation: https://github.com/eclipse-openvsx/openvsx/pull/1922 Types: Issue Tracking, Patch Added Reference Type Eclipse Foundation: https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type CISA-ADP: https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 Types: Exploit, Issue Tracking, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Added Reference https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 Added SSVC {'id': 'CVE-2026-13323', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-01T12:13:20.675139Z'} -
New CVE Received by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Eclipse Foundation', 'product': 'Eclipse Open VSX', 'versions': [{'status': 'affected', 'version': '0.1.0', 'lessThan': '1.0.2', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N Added CWE CWE-79 Added Reference https://github.com/eclipse-openvsx/openvsx/pull/1922 Added Reference https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485