{"id":"CVE-2026-53964","published":"2026-10-01T20:17:25.440","lastModified":"2026-10-02T18:47:49.947","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.","cvssScore":7.2,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-1336"],"vendors":[],"products":[],"references":[{"url":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0","tags":[]},{"url":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","tags":[]}],"exploitRefs":[{"url":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0","tags":[]},{"url":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","tags":[]}],"hasPoc":true,"ai":null}