{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-32189/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":7.8,"id":"CVE-2026-32189"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["use-after-free","code-execution","excel","cve-2026-32189"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-32189 is a use-after-free vulnerability affecting Microsoft Office Excel. This flaw can be exploited by an attacker to execute arbitrary code on a vulnerable system. The vulnerability arises from improper memory management within the application when handling specific Excel files. While the exact versions affected are not detailed, the vulnerability was reported on April 14, 2026. Successful exploitation requires a user to open a specially crafted Excel file, which triggers the use-after-free condition. This vulnerability is significant because it allows for local code execution, potentially leading to further compromise of the affected system. Defenders should prioritize patching vulnerable Excel installations and implement detection measures to identify potential exploitation attempts.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious Excel file designed to trigger the use-after-free vulnerability (CVE-2026-32189).\u003c/li\u003e\n\u003cli\u003eThe attacker delivers the malicious Excel file to the victim via email or other means.\u003c/li\u003e\n\u003cli\u003eThe victim opens the malicious Excel file using a vulnerable version of Microsoft Excel.\u003c/li\u003e\n\u003cli\u003eExcel attempts to access a memory location that has already been freed, triggering the use-after-free condition.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the memory corruption to overwrite critical data structures in Excel\u0026rsquo;s memory space.\u003c/li\u003e\n\u003cli\u003eThe attacker redirects program execution to attacker-controlled code within the Excel process.\u003c/li\u003e\n\u003cli\u003eThe attacker executes arbitrary code with the privileges of the user running Excel.\u003c/li\u003e\n\u003cli\u003eThe attacker can then install malware, steal sensitive data, or perform other malicious actions on the local system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-32189 allows an attacker to execute arbitrary code on the victim\u0026rsquo;s machine. This can lead to a complete compromise of the system, including data theft, malware installation, and privilege escalation. The vulnerability poses a significant risk to organizations that rely on Microsoft Excel for daily operations, as a single compromised user can provide a foothold for further attacks within the network. While specific victim counts are unavailable, the widespread use of Microsoft Excel suggests a potentially large attack surface.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security update released by Microsoft to patch CVE-2026-32189 immediately (\u003ca href=\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32189)\"\u003ehttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32189)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rules to detect potential exploitation attempts based on suspicious process creation and file activity.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events for unusual child processes spawned by Excel.exe, using \u003ccode\u003elogsource\u003c/code\u003e category \u003ccode\u003eprocess_creation\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eMonitor file access events for Excel accessing unusual locations or creating suspicious files, using \u003ccode\u003elogsource\u003c/code\u003e category \u003ccode\u003efile_event\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-15T12:00:00Z","date_published":"2026-04-15T12:00:00Z","id":"/briefs/2026-04-excel-uaf/","summary":"CVE-2026-32189 is a use-after-free vulnerability in Microsoft Excel that allows a local attacker to execute arbitrary code by exploiting memory corruption.","title":"Microsoft Excel Use-After-Free Vulnerability (CVE-2026-32189)","url":"https://feed.craftedsignal.io/briefs/2026-04-excel-uaf/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-32189","version":"https://jsonfeed.org/version/1.1"}