CVE-2026-8971

Same-origin policy bypass in the Networking: JAR component

CVSS 6.5 MEDIUMEPSS 0.2%CWE-346

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

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

Affected products

Want to know if your infrastructure is exposed to this?

References