CVE-2026-11420
Altium Enterprise Server’s Network Installation Service (NIS) has two path‑traversal flaws that let an unauthenticated attacker write any file to writable locations and read package archives. The flaws can be used to overwrite binaries or configuration files, potentially giving the attacker remote code execution on the server.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Altium Enterprise Server (on‑premises) – the Network Installation Service component.
Real-world impact
An attacker can place malicious files anywhere the service can write, read sensitive deployment packages, and ultimately execute code with the service account’s privileges, compromising the entire server.
Why this severity
The CVSS score of 10 reflects that the vulnerability is exploitable without authentication, allows complete compromise of confidentiality, integrity, and availability, and can lead to remote code execution with full service‑account privileges.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 5, 2026 · Jun 5, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 12d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- altium.com/platform/security-complianc…vendor advisory