by Kastro
Paper/Archive/CVE-2026-16377

CVE-2026-16377

Mozilla Firefox — Mitigation bypass in the PDF Viewer component

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 47.1.471 × 209.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Firefoxsee advisory140.13CNA
Thunderbirdsee advisory140.13CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2037770refmozilla.org/security/advisories/mfsa2026-68refmozilla.org/security/advisories/mfsa2026-70refmozilla.org/security/advisories/mfsa2026-71refmozilla.org/security/advisories/mfsa2026-72