Security Vulnerabilities
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
8.8
EPSS Score
0.002
Published
2026-07-21
Clickjacking issue in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 153.
CVSS Score
6.5
EPSS Score
0.002
Published
2026-07-21
Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
8.8
EPSS Score
0.003
Published
2026-07-21
Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVSS Score
9.1
EPSS Score
0.003
Published
2026-07-21
Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
9.1
EPSS Score
0.002
Published
2026-07-21
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVSS Score
9.8
EPSS Score
0.004
Published
2026-07-21
Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
9.8
EPSS Score
0.004
Published
2026-07-21
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
9.8
EPSS Score
0.002
Published
2026-07-21
Sandbox escape in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVSS Score
9.8
EPSS Score
0.004
Published
2026-07-21
Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVSS Score
7.5
EPSS Score
0.003
Published
2026-07-21