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CVE-2026-11431 Altium CVE debrief

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.

Vendor
Altium
Product
Altium Enterprise Server
CVSS
HIGH 8.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-08
Advisory published
2026-06-05
Advisory updated
2026-06-08

Who should care

Users of Altium Enterprise Server and Altium 365 should apply the provided patches to prevent exploitation of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. It can be exploited by an authenticated user with a crafted path parameter, allowing access to sensitive files and configuration data.

Defensive priority

High

Recommended defensive actions

  • Apply the patch for Altium Enterprise Server version 8.1.1
  • Ensure that Altium 365 has been updated to the latest service level

Evidence notes

Vendor: Altium; Product: Altium Enterprise Server and Altium 365

Official resources

CVE-2026-11431 was published on 2026-06-05T22:16:47.650Z and modified on 2026-06-08T15:00:38.710Z.