PT-2026-41902 · Mozilla · Firefox+1

Satyamasd · Published 2026-05-19 · Updated 2026-05-19 · CVE-2026-8948

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 151 Thunderbird versions prior to 151

Description A same-origin policy bypass exists in the DOM: Networking component. The same-origin policy is a critical security mechanism that restricts how a document or script loaded from one origin can interact with a resource from another origin.

Recommendations Update to version 151.

Fix

Weakness Enumeration

CWE-942

Related Identifiers

CVE-2026-8948

Affected Products

Firefox

Thunderbird

References · 5

• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8948 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-50 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2038803 · Note
• https://twitter.com/CVEnew/status/2056870271215116296 · Twitter Post