{"id":"CVE-2019-9875","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-9875","generatedAt":"2026-10-27T22:23:37.013Z","title":"Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability","description":"Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.","published":"2019-05-31T21:29:06.000Z","lastModified":"2026-06-17T02:44:46.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-502"],"affected":["sitecore/cms"],"epss":{"score":0.25436,"percentile":0.97934,"date":"2026-10-26","history":[{"date":"2026-10-25","score":0.25436,"percentile":0.97933}]},"kev":{"listed":true,"dateAdded":"2025-03-26","dueDate":"2025-04-16","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.\nhttps://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0038556 ; https://nvd.nist.gov/vuln/detail/CVE-2019-9875"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 16 April 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.25436,"from":0.13795,"percentile":0.97933},"summary":"EPSS moved from 13.8% to 25.4% probability of exploitation in the next thirty days."}],"references":[{"url":"https://dev.sitecore.net/Downloads.aspx","tags":["Product","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.synacktiv.com/blog.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf","tags":["Exploit","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://dev.sitecore.net/Downloads.aspx","tags":["Product","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.synacktiv.com/blog.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf","tags":["Exploit","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9875","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-9875","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}