{"id":61066,"date":"2026-07-15T15:21:58","date_gmt":"2026-07-15T15:21:58","guid":{"rendered":"https:\/\/www.theregister.com\/a\/5271814"},"modified":"2026-07-15T15:21:58","modified_gmt":"2026-07-15T15:21:58","slug":"cisa-sounds-alarm-over-trio-of-exploited-sharepoint-flaws","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/cisa-sounds-alarm-over-trio-of-exploited-sharepoint-flaws\/","title":{"rendered":"CISA sounds alarm over trio of exploited SharePoint flaws"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/5242008.jpg?imageId=5242008&amp;x=0&amp;y=0&amp;cropw=100&amp;croph=100&amp;panox=0&amp;panoy=0&amp;panow=100&amp;panoh=100&amp;width=1200&amp;height=683\" class=\"ff-og-image-inserted\"><\/div>\n<div data-element-guid=\"d11159dd-82a3-4c53-901c-d41dec75505c\" readability=\"32.3\">\n<p class=\"kicker \">Security<\/p>\n<p class=\"subtitle \">Three bugs are under active attack, and two more critical holes could add to the pain<\/p>\n<\/p><\/div>\n<div data-element-guid=\"4c9dc5d9-c886-4348-bf4a-01d0dc71377d\" readability=\"81.105606258149\">\n<p>The US Cybersecurity and Infrastructure Security Agency (CISA) has urged all organizations running SharePoint to harden their defenses after the disclosure of actively exploited vulnerabilities.<\/p>\n<p>The warning applies to those running any supported version of SharePoint Server on-prem, with three vulnerabilities of particular interest cited.<\/p>\n<p>A spoofing bug, CVE-2026-32201 (6.5), was the first to be mentioned. Microsoft disclosed it in March and CISA confirmed it was being actively exploited in June.<\/p>\n<p>Additionally, CISA appears concerned by CVE-2026-45659 (8.8) \u2013 a remote code execution (RCE) flaw made public in June and confirmed as being actively used in attacks last week after <a href=\"https:\/\/www.theregister.com\/security\/2026\/07\/02\/microsoft-said-exploitation-was-less-likely-but-cisa-just-added-sharepoint-rce-to-kev-list\/5265886\" target=\"_blank\">Microsoft said exploitation was &#8220;less likely.&#8221;<\/a><\/p>\n<p>The most recent of the three, CVE-2026-56164 (5.3), a privilege escalation flaw, was one of the 622 bugs that featured in <a href=\"https:\/\/www.theregister.com\/security\/2026\/07\/14\/patchpocalypse-now-microsoft-tops-last-months-record-with-622-patch-tuesday-cves\/5271434\">this month&#8217;s record Patch Tuesday<\/a>.<\/p>\n<p>CISA also picked out two more critical bugs, both from the latest Patch Tuesday, as ones that could potentially complicate SharePoint security further. Neither CVE-2026-55040 (9.1) nor CVE-2026-58644 (9.8) is being actively exploited to date, although Microsoft has attached the &#8220;Exploitation More Likely&#8221; label to both.<\/p>\n<p>CISA <a href=\"https:\/\/www.cisa.gov\/news-events\/alerts\/2026\/07\/14\/cisa-urges-sharepoint-hardening-after-new-exploitations\">said<\/a> the three exploited vulnerabilities are associated with post-exploitation activity, including the theft of Internet Information Services (IIS) machine keys and deserialization techniques, both in an effort to gain persistence and deploy malware.<\/p>\n<div data-element-guid=\"afe083ca-6701-48e9-9bd8-f8827dd7fb42\" class=\"lab4 column articleList layout_vertical imageLayout_left small-12 large-4 small-abs-12 large-abs-4 abs_grid_4 desktop-floatLeft mobile-floatLeft grid-vas-start mobile-grid-vas-start\">\n<div class=\"content border_width_0 border_width_mobile_0 border-radius-48 border-radius-mobile_48\">\n<h2 class=\"article-list-title t19 font-RobotoCondensed\">MORE CONTEXT<\/h2>\n<\/p><\/div>\n<\/div>\n<p>The agency did not offer any more detail about what led it to issue the warning, but went on to encourage defenders to review an <a href=\"https:\/\/www.cisa.gov\/news-events\/alerts\/2025\/07\/20\/update-microsoft-releases-guidance-exploitation-sharepoint-vulnerabilities\">alert<\/a> it published in August 2025, which similarly urged organizations to harden SharePoint from <a href=\"https:\/\/www.theregister.com\/security\/2025\/08\/07\/cisa-releases-malware-analysis-for-sharepoint-server-attack\/639318\">&#8220;ToolShell&#8221; attacks<\/a>.<\/p>\n<p>CISA said attackers were chaining together CVE-2025-49706 (6.5) and CVE-2025-49704 (8.8) to break into SharePoint Servers and, in some cases, deploy Warlock ransomware.<\/p>\n<p>It did not go as far as attributing the activity referenced in either SharePoint advisory to any group or country, although <a href=\"https:\/\/www.microsoft.com\/en-us\/security\/blog\/2025\/07\/22\/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities\/\">Microsoft said as far back as July 2025<\/a> that ToolShell vulnerabilities were being exploited by Chinese nation-state crews.<\/p>\n<p>Applying Microsoft&#8217;s latest security patches and verifying that Antimalware Scan Interface (AMSI) integration is enabled for each SharePoint web application are among the recommended hardening measures. <\/p>\n<p>CISA also advised defenders to go threat hunting for signs of intrusion before rotating IIS keys to avoid exposing SharePoint to the web unless it&#8217;s necessary and block external access to SharePoint Central Administration.<\/p>\n<p>As is the case with any potential intrusion, CISA encouraged organizations to implement robust, tailored logging that can detect potential exploits. \u00ae<\/p>\n<\/p><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/?imageId=5242008&#038;width=800\">READ MORE <a href=\"https:\/\/www.theregister.com\/security\/2026\/07\/15\/cisa-sounds-alarm-over-trio-of-exploited-sharepoint-flaws\/5271814\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p> Three bugs are under active attack, and two more critical holes could add to the pain READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":61067,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[307],"class_list":["post-61066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CISA sounds alarm over trio of exploited SharePoint flaws 2026 | 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