CVE-2026-8971

Same-origin policy bypass in the Networking: JAR component

State: Published
Severity: 6.5 Medium
Published: May 19, 2026
Updated: May 19, 2026
Reserved: May 19, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-346 Origin Validation Error

Affected Products

Product	Versions
FirefoxMozilla	151 and laterNot affected
ThunderbirdMozilla	151 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2032604
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-50/

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