CVE-2026-8964

Spoofing issue in the Popup Blocker component

State: Published
Severity: 7.5 High
Published: May 19, 2026
Updated: May 19, 2026
Reserved: May 19, 2026

Description

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	CISA-ADP

Weaknesses

CWE-451 User Interface (UI) Misrepresentation of Critical Information

Affected Products

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

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2025170
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-50/

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