CVE-2026-12323

Spoofing issue in the DOM: Core & HTML component

State: Published
Severity: 5.4 Medium
Published: Jun 16, 2026
Updated: Jun 16, 2026
Reserved: Jun 15, 2026

Description

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L	CISA-ADP

Weaknesses

CWE-1021 Improper Restriction of Rendered UI Layers or Frames

Affected Products

Product	Versions
FirefoxMozilla	152 and laterNot affected
ThunderbirdMozilla	152 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2035027
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-60/

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