SEPTEMBER 15, 2026
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Case File

CVE-2026-84142

CRITICAL · CVSS 9.8 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-01 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

Firefox version 154 contains internally identified bugs that may lead to memory corruption and other security-related issues, potentially allowing exploitation under certain conditions. Users and organizations relying on Firefox 154 should prioritize upgrading to version 155 to mitigate any associated risks. Given the nature of the vulnerabilities, all Firefox users, especially those in security-sensitive environments, should take immediate action to ensure their browsers are updated.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-84142
Severity
CRITICAL
CVSS
9.8
EPSS
0.30%
Firefox

Original NVD Description

Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Related CVEs

Other vulnerabilities affecting the same vendor(s)