CVE-2026-74966

Information disclosure in the Form Autofill component

State: Published
Severity: 7.5 High
Published: Aug 18, 2026
Updated: Aug 20, 2026
Reserved: Aug 17, 2026

Description

Information disclosure in the Form Autofill 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	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-359 Exposure of Private Personal Information to an Unauthorized Actor

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=2054776
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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