CVE-2025-9180: 
Mozilla Firefox vulnerability analysis and mitigation

CVE-2025-9180 is a high-impact same-origin policy bypass vulnerability discovered in the Graphics: Canvas2D component of Mozilla Firefox and Thunderbird browsers. The vulnerability was reported by security researcher Tom Van Goethem and was publicly disclosed on August 19, 2025. This security issue affects multiple versions of Firefox (including ESR versions 115.27, 128.14, and 140.2) and Thunderbird (including versions 140.2, 128.14, and 142) (Mozilla Firefox, Mozilla Thunderbird).

The vulnerability is specifically identified as a same-origin policy bypass in the Graphics: Canvas2D component. While detailed technical specifications are limited in public advisories, the issue has been assigned a high-impact severity rating by Mozilla. The vulnerability is tracked internally by Mozilla under Bug 1979782 (Mozilla Firefox).

The vulnerability has been classified as high-impact by Mozilla. In Firefox, this could potentially allow attackers to bypass same-origin policy restrictions, which are crucial security controls that prevent malicious websites from accessing data from other domains. For Thunderbird, Mozilla notes that these flaws cannot be exploited through email since scripting is disabled when reading mail, but they remain potential risks in browser-like contexts (Mozilla Thunderbird).

Mozilla has addressed this vulnerability in Firefox 142, Firefox ESR versions (115.27, 128.14, and 140.2), and Thunderbird versions (142, 140.2, and 128.14). Users are advised to update to these latest versions to protect against potential exploitation (Mozilla Firefox, Mozilla Thunderbird).