CVE-2025-13013
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
A mitigation bypass vulnerability exists in the DOM: Core & HTML component of Firefox and Thunderbird. It was fixed in Firefox 145, Firefox ESR 140.5, Firefox ESR 115.30, Thunderbird 145, and Thunderbird 140.5.
Risk Assessment
An attacker could bypass security mechanisms in the browser or email client, potentially leading to unsafe actions in the user's context. Organizations using vulnerable versions are exposed to attacks targeting web browsing and email handling.
Recommendation
Update Firefox and Thunderbird to the latest versions (Firefox 145, Firefox ESR 140.5/115.30, Thunderbird 145/140.5) or later. Prioritize updates on workstations with internet and email access.
Other vulnerabilities in Firefox and Thunderbird
See all- CVE-2026-113400Medium
An uninitialized memory vulnerability in the Audio/Video: cubeb component of Firefox and Thunderbird. The issue was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
- CVE-2026-113399Unknown
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
Original NVD description (English source)
Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Firefox ESR 115.30, Thunderbird 145, and Thunderbird 140.5.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS