{"id":5956,"date":"2026-07-13T18:01:46","date_gmt":"2026-07-13T18:01:46","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=5956"},"modified":"2026-07-23T16:58:57","modified_gmt":"2026-07-23T16:58:57","slug":"cisa-sharepoint-rce-cve-2026-45659-added-to-kev","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/sv\/cyber-varningar\/cisa-sharepoint-rce-cve-2026-45659-added-to-kev\/","title":{"rendered":"CISA Adds Actively Exploited SharePoint RCE (CVE-2026-45659) to KEV Catalog"},"content":{"rendered":"<p>On July 1, 2026, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a Microsoft SharePoint remote code execution flaw to its <a href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\" rel=\"noopener\">Known Exploited Vulnerabilities (KEV) catalog<\/a>, citing evidence of active exploitation. Tracked as <strong><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-45659\" target=\"_blank\" rel=\"noopener\">CVE-2026-45659<\/a><\/strong> and rated CVSS 8.8, the vulnerability came with an unusually tight remediation window: the Binding Operational Directive deadline for federal agencies was set for July 4, 2026, just three days after listing.<\/p>\n<h2>A deserialization flaw in SharePoint Server<\/h2>\n<p>CVE-2026-45659 is a remote code execution vulnerability caused by deserialization of untrusted data. It affects <strong>SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016<\/strong>. Exploitation requires authenticated access &mdash; but only at the low &#8220;Site Member&#8221; level, with no administrative or elevated privileges needed &mdash; and can be carried out over the network. That low bar is what makes it dangerous: any SharePoint deployment with self-service sign-up or broadly granted membership is a realistic target.<\/p>\n<h2>Patched in May, exploited by July<\/h2>\n<p>Microsoft shipped fixes for the flaw back in May 2026, so organizations that patch promptly are already protected. The risk lives in the gap between patch availability and deployment &mdash; CISA&#8217;s KEV listing means the vulnerability is being exploited in the wild now, roughly two months after the fix was published. Notably, Microsoft&#8217;s own advisory tags the bug with an &#8220;Exploitation Less Likely&#8221; assessment, a useful reminder that vendor exploitability ratings and real-world attacker behavior do not always line up.<\/p>\n<h2>What to do now<\/h2>\n<p>If you run SharePoint Server Subscription Edition, 2019, or Enterprise 2016, apply Microsoft&#8217;s May 2026 security updates immediately if you have not already. SharePoint has been a repeated target for ransomware crews and state-linked actors, and an authenticated RCE that needs only Site Member access is exactly the kind of foothold those groups look for. Review who holds membership on internet-facing SharePoint sites, tighten self-registration, and closely monitor any server that stayed unpatched after May for signs of compromise.<\/p>","protected":false},"excerpt":{"rendered":"<p>CISA added the actively exploited SharePoint RCE flaw CVE-2026-45659 (CVSS 8.8) to its KEV catalog, with a July 4 federal patch deadline.<\/p>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40],"tags":[],"class_list":["post-5956","post","type-post","status-publish","format-standard","hentry","category-cyber-alerts","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CISA Adds Exploited SharePoint RCE CVE-2026-45659 to KEV<\/title>\n<meta name=\"description\" content=\"CISA added SharePoint RCE CVE-2026-45659 (CVSS 8.8) to its KEV catalog after active exploitation.\" \/>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CISA Adds Exploited SharePoint RCE CVE-2026-45659 to KEV\" \/>\n<meta property=\"og:description\" content=\"CISA added SharePoint RCE CVE-2026-45659 (CVSS 8.8) to its KEV catalog after active exploitation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/securitybriefing.net\/sv\/cyber-varningar\/cisa-sharepoint-rce-cve-2026-45659-added-to-kev\/\" \/>\n<meta property=\"og:site_name\" content=\"Security Briefing\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-13T18:01:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-23T16:58:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/securitybriefing.net\/wp-content\/uploads\/2025\/09\/main-logo-black.png\" \/>\n\t<meta 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