Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
High-risk advisory
CVE-2026-53964
Summary
Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
Why it matters
GitHub has published a reviewed security advisory for document-merge-service. Prioritize it with other application dependency updates.
Operator check
Check whether document-merge-service is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.