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CVE-2026-16377

CRITICAL
9.8
CVSS Severity Score
EPSS Score0.0000%
EPSS Percentile0.00th
Published2026-07-21
Last Modified2026-07-24
Data SourcesNVD

Vulnerability 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.

Affected Platforms (CPE)

📦
Mozilla

Firefox

< 140.13.0< 153.0.0
📦
Mozilla

Thunderbird

< 140.13.0>= 141.0 and < 153.0

References & Advisories

🔗 https://bugzilla.mozilla.org/show_bug.cgi?id=2037770
🔗 https://www.mozilla.org/security/advisories/mfsa2026-68/
🔗 https://www.mozilla.org/security/advisories/mfsa2026-70/
🔗 https://www.mozilla.org/security/advisories/mfsa2026-71/
🔗 https://www.mozilla.org/security/advisories/mfsa2026-72/

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