SEPTEMBER 7, 2026
Live Feed
Back to database
Case File

CVE-2026-16377

CRITICAL · CVSS 9.8 EPSS 0.39%

Source: NVD + CISA KEV + EPSS · Published 2026-07-21 · Last synced 2026-08-20

CyberRota Analysis

AI-Generated

A critical vulnerability in the PDF Viewer component of Firefox allows for a mitigation bypass, potentially enabling attackers to execute arbitrary code. Users of affected versions should prioritize updating to Firefox 153 or Firefox ESR 140.13, as well as Thunderbird 153 or Thunderbird 140.13, to safeguard against exploitation. Organizations relying on these products should take immediate action to mitigate risks associated with this flaw.

CVE
CVE-2026-16377
Severity
CRITICAL
CVSS
9.8
EPSS
0.39%
Firefox

Original NVD Description

Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Related CVEs

Other vulnerabilities affecting the same vendor(s)

CVE-2026-84642 HIGH CVE-2026-84641 HIGH CVE-2026-84640 HIGH CVE-2026-84639 CRITICAL CVE-2026-84637 CRITICAL CVE-2026-84145 HIGH