CVE-2026-11431

Path Traversal in Altium Projects Service Allows Arbitrary File Read

State: Published
Severity: 8.3 High
Published: Jun 5, 2026
Updated: Jun 8, 2026
Reserved: Jun 5, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.3 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N	Altium

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
Altium Enterprise ServerAltium	before 8.1.1Affected
Altium 365Altium	unspecifiedAffected

References

https://www.altium.com/platform/security-compliance/security-advisories

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