CVE Catalog

CVE-2026-53964

HighCVSS 7.2
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.49%

40th percentile - higher than 40% of all known CVEs

Summary

In Document Merge Service prior to version 9.1.0, a remote code execution (RCE) via server-side template injection (SSTI) allows for user supplied code to be executed in the server's context where it is executed as the document-merge-server user with the UID 901 thus giving an attacker considerable control over the container. The vulnerability is limited to XLSX templates, were the xltpl library uses a npn-sandboxed Jinja environment for the processing of the template. This issue has been patched in version 9.1.0.

Risk Assessment

An attacker can execute arbitrary code on the server, potentially leading to full container compromise, data theft, or privilege escalation in the infrastructure.

Recommendation

Upgrade Document Merge Service to version 9.1.0 or later. Additionally, restrict API access to trusted users and consider using a sandbox for the Jinja environment.

Related vulnerabilities

Original NVD description (English source)

Document Merge Service is a document template merge service providing an API to manage templates and merge them with given data. Prior to version 9.1.0, a remote code execution (RCE) via server-side template injection (SSTI) allows for user supplied code to be executed in the server's context where it is executed as the document-merge-server user with the UID 901 thus giving an attacker considerable control over the container. The vulnerability is limited to XLSX templates, were the xltpl library uses a npn-sandboxed Jinja environment for the processing of the template. This issue has been patched in version 9.1.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS