PatchTheCVECVE-2026-13323: In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Ty
CVE-2026-13323 is a medium-severity flaw (CVSS 4.1) affecting open vsx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 c
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 74%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2026-07-01 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-13323?
open vsx: upgrade to 1.0.2. Exact commands for each OS are on this page.
Is CVE-2026-13323 being exploited?
CVE-2026-13323 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-13323 affect?
CVE-2026-13323 affects open vsx. Severity is medium (CVSS 4.1). 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 attacke
How urgent is CVE-2026-13323?
Priority 26/100. Public exploit reference