CVE-2026-53964 Document Merge Service - Remote Code Execution

Document Merge Service < 9.1.0 contains a server-side template injection caused by unsafe processing of XLSX templates using npn-sandboxed Jinja environment, letting remote attackers execute code as document-merge-server user, exploit requires crafted XLSX template.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.49% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-1336

Vendor fix

Upgrade to version 9.1.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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