{"schema":"threatline.record/2","record":{"id":"CVE-2019-9874","aliases":[],"summary":"Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability","details":"Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.","categories":["Unclassified"],"product":"CMS and Experience Platform (XP)","vendor":"Sitecore","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-9874","source_modified_at":"2025-10-21T23:45:35.994Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2025-03-26","due_date":"2025-04-16","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.83736,"percentile":0.99691,"score_date":"2026-10-23"},"published_at":"2019-05-31T20:11:49.000Z","modified_at":"2025-10-21T23:45:35.994Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2019-9874","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:45:35.994Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-9874.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-9874","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Nuclei","EPSS"],"references":[{"url":"https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0334035","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9874","source":"CISA KEV"},{"source":"CVE List","url":"https://dev.sitecore.net/Downloads.aspx","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.synacktiv.com/blog.html","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9874","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2025-03-26T20:22:10.699149Z"},"exploits":[{"source":"Nuclei","kind":"Scanner template","name":"Sitecore Experience Platform - Deserialization of Untrusted Data","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-9874.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2025-10-21T23:45:35.994Z","content_hash":"e5d33d3644673f559923e43655858ec478c4e3ce26933da91bd8d957bf8cb6d4"}}