PT-2026-41925 · Mozilla · Firefox+1

Surya Dev Singh · Published 2026-05-19 · Updated 2026-05-27 · CVE-2026-8971

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 Networking: JAR 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 Firefox to version 151. Update Thunderbird to version 151.

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-8971

OPENSUSE-SU-2026:10863-1

Affected Products

Firefox

Thunderbird

References · 42

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8971 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-46/#CVE-2026-8971 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8971 · Security Note
• https://ubuntu.com/security/CVE-2026-8971 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10863-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-50 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-8971 · Security Note
• https://suse.com/security/cve/CVE-2026-8958 · Note
• https://suse.com/security/cve/CVE-2026-8961 · Note
• https://twitter.com/CVEnew/status/2056870247261413619 · Twitter Post
• https://suse.com/security/cve/CVE-2026-8951 · Note
• https://suse.com/security/cve/CVE-2026-8949 · Note
• https://suse.com/security/cve/CVE-2026-8959 · Note
• https://suse.com/security/cve/CVE-2026-8962 · Note