by Kastro
Paper/Archive/CVE-2026-16349

CVE-2026-16349

Mozilla Firefox — Same-origin policy bypass in the DOM: Navigation component

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
34
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 22.7.227 × 204.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory115.38CNA
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=2034682refmozilla.org/security/advisories/mfsa2026-68refmozilla.org/security/advisories/mfsa2026-69refmozilla.org/security/advisories/mfsa2026-70refmozilla.org/security/advisories/mfsa2026-71refmozilla.org/security/advisories/mfsa2026-72