{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-4722/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Firefox","Thunderbird"],"_cs_severities":["high"],"_cs_tags":["cve-2026-4722","privilege-escalation","mozilla","firefox","thunderbird"],"_cs_type":"advisory","_cs_vendors":["Mozilla"],"content_html":"\u003cp\u003eCVE-2026-4722 is a critical privilege escalation vulnerability affecting the Inter-Process Communication (IPC) component in Mozilla Firefox and Thunderbird. This vulnerability impacts versions prior to 149 of both applications. The vulnerability, disclosed in March 2026, could allow a malicious actor to elevate their privileges within the affected application and potentially gain broader system access. Exploitation likely involves crafting malicious IPC messages that bypass security checks within the vulnerable component. Due to the widespread use of Firefox and Thunderbird, this vulnerability poses a significant risk to a large user base across various operating systems. Successful exploitation could lead to arbitrary code execution and data compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Compromise:\u003c/strong\u003e The attacker first needs to achieve initial access to the target system, possibly through phishing, drive-by download or exploiting another vulnerability.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eLocal Access:\u003c/strong\u003e The attacker gains a foothold on the system with limited privileges. This could be a standard user account.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eCraft Malicious IPC Message:\u003c/strong\u003e The attacker crafts a specially designed IPC message, exploiting the vulnerability (CVE-2026-4722) in Firefox or Thunderbird.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eTrigger Vulnerability:\u003c/strong\u003e The attacker delivers the malicious IPC message to the vulnerable IPC component within Firefox or Thunderbird.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePrivilege Escalation:\u003c/strong\u003e Upon processing the malicious message, the vulnerable IPC component improperly grants elevated privileges to the attacker's process.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eArbitrary Code Execution:\u003c/strong\u003e With elevated privileges, the attacker can now execute arbitrary code within the context of the Firefox or Thunderbird process, potentially gaining full control of the application.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eSystem Access:\u003c/strong\u003e The attacker leverages the elevated privileges within the application to gain access to sensitive data, modify system settings, or execute further malicious activities on the host system.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePersistence (Optional):\u003c/strong\u003e The attacker may establish persistence mechanisms to maintain access to the compromised system even after a reboot.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-4722 can lead to significant consequences. An attacker can gain elevated privileges, potentially leading to arbitrary code execution on the affected system. This could enable data theft, installation of malware, or complete system compromise. Given the wide usage of Firefox and Thunderbird, a successful attack could affect a large number of users across various sectors. The vulnerability has a CVSS v3.1 score of 8.8 (HIGH), indicating a severe threat.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Mozilla Firefox and Thunderbird to version 149 or later to patch CVE-2026-4722.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026quot;Detect Exploitation of CVE-2026-4722 via IPC Message\u0026quot; to identify potential exploitation attempts (see \u0026quot;rules\u0026quot; section).\u003c/li\u003e\n\u003cli\u003eMonitor process execution within Firefox and Thunderbird for unusual activity following potential exploitation as outlined in the Attack Chain.\u003c/li\u003e\n\u003cli\u003eImplement least privilege principles to limit the impact of successful privilege escalation.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-02T12:00:00Z","date_published":"2024-01-02T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-cve-2026-4722/","summary":"CVE-2026-4722 is a privilege escalation vulnerability in the IPC component of Mozilla Firefox and Thunderbird versions less than 149, potentially allowing an attacker to gain elevated privileges on a compromised system.","title":"CVE-2026-4722 - Mozilla Firefox and Thunderbird Privilege Escalation","url":"https://feed.craftedsignal.io/briefs/2024-01-cve-2026-4722/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-4722","version":"https://jsonfeed.org/version/1.1"}