{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53964","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-11T15:50:01.282Z","datePublished":"2026-10-01T19:55:07.504Z","dateUpdated":"2026-10-01T20:13:16.003Z"},"containers":{"cna":{"title":"Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)","problemTypes":[{"descriptions":[{"cweId":"CWE-1336","lang":"en","description":"CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc"},{"name":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0"}],"affected":[{"vendor":"adfinis","product":"document-merge-service","versions":[{"version":"< 9.1.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-01T19:55:07.504Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-w47q-945m-q9pc","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-01T20:12:41.561346Z","id":"CVE-2026-53964","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-01T20:13:16.003Z"}}]}}