{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-27907/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.8,"id":"CVE-2026-27907"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Windows"],"_cs_severities":["high"],"_cs_tags":["privilege-escalation","windows","cve-2026-27907"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-27907 is an integer underflow vulnerability affecting the Windows Storage Spaces Controller.  Discovered and reported to Microsoft, this vulnerability allows an attacker who already possesses local access and authorization on a Windows system to escalate their privileges. The specific details of the vulnerability lie within the handling of integer values within the Storage Spaces Controller, where an underflow condition can be triggered, leading to unexpected behavior and a potential privilege escalation scenario. This vulnerability was published on 2026-04-14. Exploitation requires an attacker to be authenticated and able to interact with the Storage Spaces Controller. Successful exploitation grants the attacker elevated privileges on the compromised system, potentially leading to complete system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to a Windows system with a standard user account.\u003c/li\u003e\n\u003cli\u003eAttacker authenticates to the local system.\u003c/li\u003e\n\u003cli\u003eAttacker interacts with the Windows Storage Spaces Controller.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a specific input to the Storage Spaces Controller, triggering an integer underflow condition during a size calculation.\u003c/li\u003e\n\u003cli\u003eThe integer underflow results in a smaller-than-expected buffer allocation.\u003c/li\u003e\n\u003cli\u003eSubsequent operations write beyond the allocated buffer, overwriting adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe memory corruption allows the attacker to overwrite security-sensitive data structures related to privilege levels.\u003c/li\u003e\n\u003cli\u003eThe attacker elevates their privileges to SYSTEM or another high-privilege account.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-27907 allows a local attacker to escalate their privileges on a Windows system. This could lead to unauthorized access to sensitive data, installation of malware, or complete control over the affected system. Given the nature of Storage Spaces, systems managing large storage arrays are particularly attractive targets. While the number of victims is currently unknown, a successful attack allows complete compromise of the local machine.\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-2026-27907 as soon as possible.\u003c/li\u003e\n\u003cli\u003eMonitor systems for suspicious activity related to the Storage Spaces Controller (see process creation rule below).\u003c/li\u003e\n\u003cli\u003eConsider enabling and reviewing audit logs related to Storage Spaces for anomalies (reference related log source).\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rules to detect potential exploitation attempts in your environment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T18:00:00Z","date_published":"2024-01-03T18:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-cve-2026-27907/","summary":"CVE-2026-27907 is an integer underflow vulnerability in the Windows Storage Spaces Controller, allowing a local attacker with authorization to escalate privileges on the system.","title":"Windows Storage Spaces Controller Integer Underflow Vulnerability (CVE-2026-27907)","url":"https://feed.craftedsignal.io/briefs/2024-01-cve-2026-27907/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-27907","version":"https://jsonfeed.org/version/1.1"}