CVE-2026-6753
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
Incorrect boundary conditions were found in the WebRTC component of Firefox and Thunderbird, potentially leading to unexpected behavior. The vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Risk Assessment
The organization is at risk of attacks involving real-time audio/video stream processing, which could enable remote code execution or data leakage.
Recommendation
Immediately update Firefox to version 150 or later, and Thunderbird to version 150 or 140.10 (depending on the ESR branch).
Other vulnerabilities in WebRTC
See all- CVE-2026-8094Critical
An unspecified vulnerability was found in the WebRTC component of Firefox and Thunderbird. The flaw was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.
- CVE-2026-2757Critical
A vulnerability in the WebRTC: Audio/Video component of Firefox and Thunderbird due to incorrect boundary conditions. The flaw is fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-6752High
A vulnerability in the WebRTC component of Firefox and Thunderbird is caused by incorrect boundary conditions. The flaw was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
- CVE-2026-6747High
A use-after-free vulnerability was found in the WebRTC component of Firefox and Thunderbird. The flaw was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Original NVD description (English source)
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.