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CVE-2026-11414 Altium CVE debrief

CVE-2026-11414 is a critical vulnerability in Altium Enterprise Server. The issue involves a hard-coded cryptographic key used to sign file download URLs in the Vault service. This key is identical across all installations, allowing an unauthenticated network attacker to forge valid download signatures and retrieve files from the Vault storage area without authentication. Additionally, a path traversal vulnerability in the same download endpoint enables reads of arbitrary files on the server filesystem. These issues can be combined to allow an unauthenticated attacker to obtain sensitive server configuration and key material, potentially leading to full server compromise. The vulnerability can be chained with CVE-2026-9152 for further exploitation. Notably, Altium 365 cloud deployments are not impacted as they use object storage instead of the local filesystem.

Vendor
Altium
Product
Altium Enterprise Server
CVSS
CRITICAL 10
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-16
Advisory published
2026-06-05
Advisory updated
2026-06-16

Who should care

Administrators and users of Altium Enterprise Server should be aware of this critical vulnerability. The ability to forge download signatures and read arbitrary files without authentication poses a significant risk to the security of the server and its data.

Technical summary

The vulnerability is caused by a hard-coded cryptographic key used for signing file download URLs in the Vault service of Altium Enterprise Server. This key is identical across all installations, making it possible for an unauthenticated attacker to forge valid download signatures. Furthermore, a path traversal vulnerability exists in the download endpoint, allowing the reading of arbitrary files on the server filesystem. These vulnerabilities can be exploited together to gain sensitive information, potentially leading to full server compromise.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Altium to address the hard-coded cryptographic key and path traversal vulnerabilities.
  • Review and restrict access to the Vault service and download endpoints.
  • Monitor server logs for suspicious activity related to the Vault service and file downloads.
  • Consider implementing additional security measures such as authentication and authorization for accessing the Vault storage area.

Evidence notes

The CVE-2026-11414 details were obtained from the official CVE record and NVD detail pages. The information provided indicates a critical vulnerability with a CVSS score of 10.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11414 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11414

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11414 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11414

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

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

    4760f414-e1ae-4ff1-bdad-c7a9c3538b79

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.