{"schema":"threatline.record/2","record":{"id":"CVE-2026-53964","aliases":["GHSA-w47q-945m-q9pc","PYSEC-2026-3830"],"summary":"Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)","details":"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.","categories":["Libraries & packages"],"product":"document-merge-service","vendor":"adfinis","ecosystem":"PyPI","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-53964","source_modified_at":"2026-10-01T20:13:16.003Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"document-merge-service","vendor":"adfinis","versions":[{"status":"affected","version":"< 9.1.0"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-w47q-945m-q9pc","source_modified_at":"2026-09-10T12:25:55.406064842Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"document-merge-service","ecosystem":"PyPI","purl":"pkg:pypi/document-merge-service"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.0"}]}],"versions":["5.2.0","5.2.1","6.0.0","6.1.0","6.1.1","6.1.2","6.2.0","6.2.1","6.2.2","6.3.0","6.3.1","6.4.0","6.4.1","6.4.2","6.4.3","6.4.4","6.4.5","6.4.6","6.5.0","6.5.1","6.5.2","6.6.0","6.6.1","7.0.0","7.0.1","7.0.2","7.1.0","8.0.0","8.0.2","8.0.3","8.1.0","9.0.0"]}],"fixed_versions":[{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-w47q-945m-q9pc","source_modified_at":"2026-09-10T12:25:55.406064842Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"document-merge-service","ecosystem":"PyPI","purl":"pkg:pypi/document-merge-service"},"version":"9.1.0"}],"cvss":7.2,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00493,"percentile":0.41433,"score_date":"2026-10-23"},"published_at":"2026-10-01T19:55:07.504Z","modified_at":"2026-10-01T20:13:16.003Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-53964","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-01T20:13:16.003Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-w47q-945m-q9pc","fetched_at":"2026-10-23T18:55:00.935475Z","source_modified_at":"2026-09-10T12:25:55.406064842Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-53964","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-01T20:12:41.561346Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-01T20:13:16.003Z","content_hash":"0cfa5aeb86d4034bfe57e79ac18c1a87804777d54f58a60b03a3c3890f063164"}}