CVE-2026-74978

Clickjacking issue in the Widget component

State: Published
Severity: 8.1 High
Published: Aug 18, 2026
Updated: Aug 18, 2026
Reserved: Aug 17, 2026

Description

Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-1021 Improper Restriction of Rendered UI Layers or Frames

Affected Products

Product	Versions
FirefoxMozilla	153.1 through 153.*Not affected 154 and laterNot affected
ThunderbirdMozilla	153.1 through 153.*Not affected 154 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2036097
https://www.mozilla.org/security/advisories/mfsa2026-74/
https://www.mozilla.org/security/advisories/mfsa2026-77/
https://www.mozilla.org/security/advisories/mfsa2026-78/
https://www.mozilla.org/security/advisories/mfsa2026-80/

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