{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-32188/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":7.1,"id":"CVE-2026-32188"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["excel","out-of-bounds read","cve-2026-32188","information disclosure","vulnerability"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-32188 describes an out-of-bounds read vulnerability affecting Microsoft Office Excel. According to the NVD, this vulnerability allows an unauthorized attacker to disclose information locally. The CVSS v3.1 score is 7.1, indicating a high severity. The vulnerability resides within how Excel parses certain file formats, potentially allowing a malicious actor to craft a file that, when opened, causes Excel to read memory outside of allocated buffers. This can lead to the disclosure of sensitive information contained in the application\u0026rsquo;s memory space. While the source doesn\u0026rsquo;t specify affected versions or a specific attack campaign, successful exploitation requires user interaction to open the malicious file. Defenders should focus on detecting abnormal process behavior in Excel and promptly applying available patches.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious Excel file designed to trigger the out-of-bounds read vulnerability (CVE-2026-32188).\u003c/li\u003e\n\u003cli\u003eThe attacker delivers the crafted Excel file to a victim via social engineering or other means.\u003c/li\u003e\n\u003cli\u003eThe victim opens the malicious Excel file.\u003c/li\u003e\n\u003cli\u003eExcel attempts to parse the malformed data structures within the file.\u003c/li\u003e\n\u003cli\u003eDue to the vulnerability, Excel reads memory outside the intended buffer boundaries.\u003c/li\u003e\n\u003cli\u003eThe out-of-bounds read results in the disclosure of sensitive information from Excel\u0026rsquo;s memory.\u003c/li\u003e\n\u003cli\u003eThe attacker retrieves the disclosed information, potentially containing sensitive data or internal application state.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the disclosed information for further malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-32188 can lead to the disclosure of sensitive information from the victim\u0026rsquo;s system. While the vulnerability is local, the disclosed information could include credentials, internal network details, or other sensitive data that could be used for further attacks. The number of potential victims is broad, encompassing any user of Microsoft Office Excel. The impact could range from minor data leaks to more significant compromises depending on the nature of the disclosed information.\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-2026-32188 on all affected systems. Reference the Microsoft advisory linked in the references section for specific instructions.\u003c/li\u003e\n\u003cli\u003eImplement the Sigma rule \u0026ldquo;Detect Suspicious Excel Process Creation\u0026rdquo; to identify potentially malicious Excel activity.\u003c/li\u003e\n\u003cli\u003eMonitor for unusual network connections originating from Excel processes after opening untrusted documents.\u003c/li\u003e\n\u003cli\u003eEducate users about the risks of opening unsolicited or suspicious Excel files to prevent initial access.\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-oob-read/","summary":"An out-of-bounds read vulnerability in Microsoft Office Excel (CVE-2026-32188) allows a local attacker to potentially disclose sensitive information through a maliciously crafted Excel file.","title":"Microsoft Excel Out-of-Bounds Read Vulnerability (CVE-2026-32188)","url":"https://feed.craftedsignal.io/briefs/2026-04-excel-oob-read/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-32188","version":"https://jsonfeed.org/version/1.1"}