{"id":"CVE-2026-65660","published":"2026-08-11T17:18:54Z","modified":"2026-10-26T13:10:00Z","title":"Microsoft SharePoint Code Injection Vulnerability","vendor":"Microsoft","product":"SharePoint","tier":"core","eol":null,"description":{"text":"Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","provenance":"source","from":"NVD"},"summary":{"text":"The Microsoft SharePoint component of Microsoft Office SharePoint contains a code injection flaw, classified as improper control of code generation. An attacker with valid low-privilege credentials and network access can exploit it to execute code, with no user interaction required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T08:31:20Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.08189,"percentile":0.94862,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-09-25","dueDate":"2026-09-28","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65660","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-24","exploitedFirstSeen":"2026-09-24","ransomware":false,"evidence":[{"url":"https://previdian.com/CVE-2026-65660","date":"2026-09-24"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-09-25"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":31,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"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"}],"provenance":"machine"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660","tags":["Patch","Vendor Advisory"]},{"url":"https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660","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: Network-exposed SharePoint service exploited for code execution","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allows an authorized attacker to execute code over a network","start":89,"end":149}],"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: Code injection yields arbitrary code execution","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Improper control of generation of code ('code injection')","start":0,"end":57}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-56431","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-56431","exploited":true,"exploitedSince":"2026-09-25","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2026-09-25","earliestUrl":"https://github.com/HORKimhab/CVE-2026-65660","repos":[{"name":"ShadowForge-Cyber/CVE-2026-65660-Poc","url":"https://github.com/ShadowForge-Cyber/CVE-2026-65660-Poc","stars":1,"created":"2026-09-25"},{"name":"HORKimhab/CVE-2026-65660","url":"https://github.com/HORKimhab/CVE-2026-65660","stars":0,"created":"2026-09-25"}]},"first":{"date":"2026-09-25","source":"PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-65660"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-08-11","kind":"published","label":"Published 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