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.

Project Subscriptions

No data.

Advisories
Source ID Title
Github GHSA Github GHSA GHSA-w47q-945m-q9pc Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 01 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 01 Oct 2026 20:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
Weaknesses CWE-1336
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-01T20:13:16.003Z

Reserved: 2026-06-11T15:50:01.282Z

Link: CVE-2026-53964

cve-icon Vulnrichment

Updated: 2026-10-01T20:13:11.004Z

cve-icon NVD

Status : Received

Published: 2026-10-01T20:17:25.440

Modified: 2026-10-01T21:17:21.417

Link: CVE-2026-53964

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses