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Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53964

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53964

document-merge-service

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "adfinis",
    "product": "document-merge-service",
    "versions": [
      {
        "status": "affected",
        "version": "< 9.1.0"
      }
    ]
  }
]
Related CVEs
CVE-2026-53964

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#7757 · Revision 1
Added to Heist Feed
Publisher date
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