{"id":"CVE-2025-53690","published":"2025-09-03T20:15:33Z","modified":"2026-10-18T21:10:00Z","title":"Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability","vendor":"Sitecore","product":"Multiple Products","tier":"core","eol":null,"description":{"text":"Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.","provenance":"source","from":"NVD"},"summary":{"text":"A deserialization of untrusted data flaw exists in multiple Sitecore products, specifically Sitecore Experience Manager (XM) and Sitecore Experience Platform (XP), and it enables code injection. An attacker with network access and no authentication or user interaction could exploit it, though the attack complexity is high, per the attack vector details provided.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:11Z"},"cvss":{"score":9.0,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.60601,"percentile":0.99142,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2025-09-04","dueDate":"2025-09-25","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53690","provenance":"source"},"vulncheckKev":{"dateAdded":"2025-09-03","exploitedFirstSeen":"2025-09-03","ransomware":false,"evidence":[{"url":"https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability","date":"2025-09-03"},{"url":"https://www.acn.gov.it/portale/w/sitecore-rilevato-sfruttamento-di-vulnerabilita-zero-day","date":"2025-09-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2025-09-04"},{"url":"https://www.huntress.com/blog/craftiest-trends-scams-tradecraft-2025","date":"2025-10-02"},{"url":"https://www.recordedfuture.com/blog/september-2025-cve-landscape","date":"2025-10-17"},{"url":"https://www.rapid7.com/cdn/assets/bltbd2f1cd70f9e3e7f/691360b9c91291146f1a5308/threat-landscape-report-q3-2025.pdf","date":"2025-11-12"},{"url":"https://cyble.com/resources/research-reports/global-cybersecurity-report/","date":"2025-12-11"},{"url":"https://blog.talosintelligence.com/uat-8837/","date":"2026-01-15"},{"url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","date":"2026-01-20"},{"url":"https://medium.com/@nshcthreatrecon/weekly-threat-intelligence-report-19-jan-2026-2b8b4ea76087","date":"2026-01-21"}],"evidenceTotal":12,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability","tags":["Exploit","Third Party Advisory"]},{"url":"https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53690","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Public-facing web application deserialization flaw, network exploitable","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM)","start":0,"end":83}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Injected code executes on server","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allows Code Injection","start":119,"end":140}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-26629","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-26629","exploited":true,"exploitedSince":"2025-09-04","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":3,"skipped":0,"earliest":"2025-09-04","earliestUrl":"https://github.com/rxerium/CVE-2025-53690","repos":[{"name":"ErikLearningSec/CVE-2025-53690-POC","url":"https://github.com/ErikLearningSec/CVE-2025-53690-POC","stars":8,"created":"2025-11-05"},{"name":"rxerium/CVE-2025-53690","url":"https://github.com/rxerium/CVE-2025-53690","stars":5,"created":"2025-09-04"},{"name":"m0d0ri205/CVE-2025-53690-Analysis","url":"https://github.com/m0d0ri205/CVE-2025-53690-Analysis","stars":3,"created":"2025-09-07"}]},"first":{"date":"2025-09-04","source":"PoC-in-GitHub","url":"https://github.com/rxerium/CVE-2025-53690"},"provenance":"source"},"exploitRefs":["https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2025-09-03","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53690","provenance":"source"},{"date":"2025-09-03","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability","provenance":"source"},{"date":"2025-09-04","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/rxerium/CVE-2025-53690","provenance":"source"},{"date":"2025-09-04","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2025-09-04","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-26629","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":1},"priority":{"score":69.1,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 422 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.83,"detail":"percentile 0.9914"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 3 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.3,"detail":"base score 9.0"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}