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.
Published: 2026-10-01
Score: 7.2 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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


Subscriptions

No data.

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