{"id":"CVE-2026-53964","state":"PUBLISHED","title":"Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)","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.","publishedAt":"2026-10-01T19:55:07.504Z","updatedAt":"2026-10-01T20:13:16.003Z","severity":{"score":7.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["adfinis document-merge-service"],"affected":[{"vendor":"adfinis","product":"document-merge-service","versions":[{"version":"< 9.1.0","status":"affected"}]}],"references":["https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0"],"weaknesses":["CWE-1336"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53964.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53964","state":"PUBLISHED","datePublished":"2026-10-01T19:55:07.504Z","dateUpdated":"2026-10-01T20:13:16.003Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-11T15:50:01.282Z"},"containers":{"cna":{"title":"Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)","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."}],"affected":[{"vendor":"adfinis","product":"document-merge-service","versions":[{"version":"< 9.1.0","status":"affected"}]}],"references":[{"url":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","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/releases/tag/v9.1.0","name":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1336","lang":"en","description":"CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-01T19:55:07.504Z"},"source":{"advisory":"GHSA-w47q-945m-q9pc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-01T20:13:16.003Z"}}]}}}