{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-5773/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*"],"_cs_cves":[{"cvss":7.5,"id":"CVE-2026-5773"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["smb","vulnerability","cve-2026-5773"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eOn May 19, 2026, Microsoft disclosed CVE-2026-5773, a security vulnerability concerning the improper reuse of Server Message Block (SMB) connections. This flaw could potentially allow an attacker to intercept or manipulate SMB communications. While the specifics of the vulnerability are not detailed in the initial advisory, the incorrect handling of SMB sessions can lead to various security issues. It is crucial to apply the security updates provided by Microsoft to mitigate the risk associated with this vulnerability. Further investigation and patching are necessary to fully understand and address the potential impact.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies a vulnerable system utilizing SMB.\u003c/li\u003e\n\u003cli\u003eThe attacker initiates an SMB connection to the target.\u003c/li\u003e\n\u003cli\u003eThe vulnerable system incorrectly reuses an existing SMB connection for a different or unauthorized purpose (CVE-2026-5773).\u003c/li\u003e\n\u003cli\u003eThe attacker intercepts the SMB traffic due to the incorrect session reuse.\u003c/li\u003e\n\u003cli\u003eThe attacker gains unauthorized access to sensitive data transmitted over the SMB connection.\u003c/li\u003e\n\u003cli\u003eThe attacker modifies SMB traffic, potentially executing arbitrary commands on the target system.\u003c/li\u003e\n\u003cli\u003eThe attacker escalates privileges by leveraging the manipulated SMB connection.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves complete control over the compromised system, potentially leading to data exfiltration or system disruption.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-5773 could allow an attacker to intercept or manipulate SMB communications, potentially leading to unauthorized access to sensitive data, privilege escalation, and complete system compromise. While the number of potential victims and affected sectors is unknown at this time, organizations relying on SMB for file sharing and inter-process communication are at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security updates released by Microsoft to patch CVE-2026-5773 on all affected systems.\u003c/li\u003e\n\u003cli\u003eMonitor SMB traffic for suspicious activity, such as unexpected connection reuse using the provided Sigma rules.\u003c/li\u003e\n\u003cli\u003eReview and enforce strict SMB security policies, including strong authentication and access controls.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-19T07:13:35Z","date_published":"2026-05-19T07:13:35Z","id":"https://feed.craftedsignal.io/briefs/2026-05-smb-reuse/","summary":"Microsoft published information about CVE-2026-5773, a vulnerability related to the incorrect reuse of SMB connections.","title":"CVE-2026-5773: SMB Connection Reuse Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-smb-reuse/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-5773","version":"https://jsonfeed.org/version/1.1"}