CVE-2026-8971

6.5 MEDIUM

Published: May 19, 2026 Modified: May 20, 2026

Description

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

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Patch Vendor Advisory Exploit Third Party Advisory

Source: security@mozilla.org

Permissions Required

Source: security@mozilla.org

Vendor Advisory

Source: security@mozilla.org

Vendor Advisory

3 reference(s) from NVD

CVSS v3 Score

6.5 / 10.0

EPSS (Exploit Probability)

0.1%

4th percentile

Exploitation Status

Not in CISA KEV

CWE-346

mozilla