CVE-2026-53964 — Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
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 …
Published: 2026-10-01 · CVSS: 7.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7