CVE-2026-11431 Path Traversal in Altium Projects Service Allows Arbitrary File Read
Authenticated attackers can exploit path traversal in Altium Projects Service to read arbitrary server files, including sensitive configuration and credentials.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11431?
CVE-2026-11431 is a high-severity path traversal vulnerability in Altium 365, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A path traversal vulnerability exists in the Projects Service download endpoint shared by Altium Enterprise Server and Altium 365. An authenticated user can supply a crafted path parameter that bypasses validation, allowing arbitrary files (including entire directories returned as archives) to be read from the server filesystem.
Because the readable files include service configuration and credential material, exploitation can be used to gather information enabling further compromise. The issue can be combined with CVE-2026-11424 to reach the cloud-side endpoint. On multi-tenant Altium 365 deployments, the readable configuration could have exposed credentials shared across services. Altium Enterprise Server is fixed in 8.1.1; the issue has been remediated in Altium 365 at the service level.
Which versions are affected by CVE-2026-11431?
How do I fix CVE-2026-11431?
No fix has been published for CVE-2026-11431 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-11431 being exploited?
There is no known exploitation of CVE-2026-11431 in the wild and no public exploit code.
Sources
Also known as GHSA-96xj-rmhf-c584.