CVE-2026-8948CRITICAL 9.1EPSS p34.6%

CVE-2026-8948CVE-2026-8948

mozilla / firefox

Description

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.42% probability of exploitation · percentile 34.6% · 2026-08-03T12:00:16Z
Published2026-05-19
Last modified2026-07-15

Underlying weaknesses· 1

CWE-942

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2038803
  2. https://www.mozilla.org/security/advisories/mfsa2026-46/
  3. https://www.mozilla.org/security/advisories/mfsa2026-50/

1

TypeTargetConfidenceTier
WeaknessPermissive Cross-domain Security Policy with Untrusted Domainscwe-9420%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.