CVE-2026-53964
Document Merge Service is a document template merge service providing an API to manage templates and merge them with given data. Prior to ve
CVSS
7.2
High
EPSS
0.5%
p42
KEV
—
Exploit Today
13
0-100
Published: Oct 1, 2026 · Last modified: Oct 2, 2026 · CWE-1336
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.