{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-4705/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":["critical"],"_cs_tags":["cve-2026-4705","webrtc","firefox","thunderbird","vulnerability"],"_cs_type":"advisory","_cs_vendors":["Mozilla"],"content_html":"\u003cp\u003eCVE-2026-4705 details an undefined behavior vulnerability within the WebRTC signaling component of Mozilla Firefox and Thunderbird. Specifically, Firefox versions prior to 149, Firefox ESR versions prior to 140.9, Thunderbird versions prior to 149, and Thunderbird ESR versions prior to 140.9 are affected. This vulnerability could potentially allow an attacker to execute arbitrary code due to unexpected behavior when handling WebRTC signaling, making it critical for organizations relying on these applications to address this issue promptly. The vulnerability was reported on March 24, 2026.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious web page or email containing specially crafted WebRTC signaling data.\u003c/li\u003e\n\u003cli\u003eA user opens the malicious web page in a vulnerable version of Firefox or Thunderbird or views the malicious email.\u003c/li\u003e\n\u003cli\u003eThe vulnerable application processes the malicious WebRTC signaling data.\u003c/li\u003e\n\u003cli\u003eDue to the undefined behavior in the WebRTC signaling component, the application enters an unexpected state.\u003c/li\u003e\n\u003cli\u003eThis unexpected state allows the attacker to potentially corrupt memory or execute arbitrary code.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the arbitrary code execution to gain control of the affected system.\u003c/li\u003e\n\u003cli\u003eThe attacker may then install malware, steal sensitive data, or pivot to other systems on the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-4705 could allow a remote attacker to execute arbitrary code on a vulnerable system. Given the widespread use of Firefox and Thunderbird, a successful exploit could have a significant impact, potentially affecting a large number of users and organizations. Exploitation could lead to data breaches, system compromise, and further malicious activities.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Firefox to version 149 or later to patch CVE-2026-4705.\u003c/li\u003e\n\u003cli\u003eUpgrade Firefox ESR to version 140.9 or later to patch CVE-2026-4705.\u003c/li\u003e\n\u003cli\u003eUpgrade Thunderbird to version 149 or later to patch CVE-2026-4705.\u003c/li\u003e\n\u003cli\u003eUpgrade Thunderbird ESR to version 140.9 or later to patch CVE-2026-4705.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect_CVE_2026_4705_Crash\u003c/code\u003e to monitor for potential exploitation attempts based on unexpected crashes in Firefox or Thunderbird related to WebRTC.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-18T12:00:00Z","date_published":"2024-01-18T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-18-webrtc-undefined-behavior/","summary":"An undefined behavior vulnerability in the WebRTC signaling component affects Mozilla Firefox and Thunderbird, potentially leading to arbitrary code execution.","title":"Mozilla Firefox and Thunderbird WebRTC Undefined Behavior Vulnerability (CVE-2026-4705)","url":"https://feed.craftedsignal.io/briefs/2024-01-18-webrtc-undefined-behavior/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-4705","version":"https://jsonfeed.org/version/1.1"}