CVE-2026-53964

Published: Oct 1, 2026Modified: Oct 2, 2026Deferred

7.2

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.2 / Impact: 5.9

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-1336

Improper Neutralization of Special Elements Used in a Template Engine

The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

References (2)

https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0

Source: security-advisories@github.com

https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc

Source: security-advisories@github.com

Timeline

No history available yet.