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PatchSiren cyber security CVE debrief

CVE-2026-11429 Altium CVE debrief

CVE-2026-11429 is a critical vulnerability (CVSS Score: 10) affecting Altium Enterprise Server and Altium 365. The vulnerability exists in two endpoints of the Vault Service ScriptsController, which allow file uploads with user-supplied filenames used to construct destination paths without validation. This allows an unauthenticated network attacker to write arbitrary files to any location writable by the service account, leading to remote code execution under the Vault Service account. The issue was fixed in Altium Enterprise Server version 8.1.1 and remediated at the service level in Altium 365.

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
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Security teams and administrators responsible for Altium Enterprise Server and Altium 365 deployments should prioritize patching this vulnerability to prevent potential exploitation.

Technical summary

The vulnerability allows unauthenticated remote code execution due to insecure file upload handling in Altium Enterprise Server and Altium 365. Specifically, two endpoints in the Vault Service ScriptsController accept file uploads with user-supplied filenames that are used to construct destination paths without validation. This enables an attacker to write arbitrary files to any location writable by the service account, leading to remote code execution under the Vault Service account.

Defensive priority

High

Recommended defensive actions

  • Apply the patch: Upgrade Altium Enterprise Server to version 8.1.1 or later.
  • For Altium 365 users, check with your service provider for confirmation that the issue has been remediated at the service level.
  • Restrict access to the affected endpoints until patching can be performed.
  • Monitor system logs for suspicious file upload and execution activity.

Evidence notes

The CVE record and details were obtained from the official CVE.org and NVD sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11429 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11429

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

  • CVE-2026-11429 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11429

    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.