CVE-2026-8950CRITICAL 9.3EPSS p9.2%

CVE-2026-8950CVE-2026-8950

Description

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Scoring

CVSS 3.19.3 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
EPSS0.19% probability of exploitation · percentile 9.2% · 2026-06-19T12:03:05Z
Published2026-05-19
Last modified2026-05-20

Underlying weaknesses· 1

CWE-346

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1965430
  2. https://www.mozilla.org/security/advisories/mfsa2026-46/
  3. https://www.mozilla.org/security/advisories/mfsa2026-48/
  4. https://www.mozilla.org/security/advisories/mfsa2026-50/
  5. https://www.mozilla.org/security/advisories/mfsa2026-51/

1

TypeTargetConfidenceTier
WeaknessOrigin Validation Errorcwe-3460%live

Related by meaning· 6

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