CVE Catalog

CVE-2026-92074

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.11%

1th percentile - higher than 1% of all known CVEs

Summary

Mitigation bypass vulnerability in the Popup Blocker component of Firefox and Thunderbird. The flaw was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Risk Assessment

Bypassing the popup blocker may allow an attacker to display unwanted content or use this vector for further phishing attacks. Organizations running unpatched versions face increased social engineering risk.

Recommendation

Update Firefox to version 156 or ESR 153.3, and Thunderbird to version 156 or 153.3. If immediate patching is not possible, consider restricting browsing of untrusted websites.

Related vulnerabilities

Original NVD description (English source)

Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS