CVE-2026-4712 — Sensitive Information Exposure in Mozilla Firefox

CWE-200 — Sensitive Information ExposureCWE-359 — Exposure of Private Personal Information to an Unauthorized Actor13 documents9 sources
Severity
7.5HIGHNVD
EPSS
0.0%
top 96.55%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Mozilla Firefox
Timeline
PublishedMar 24

Description

Information disclosure in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages1 packages

▶NVDmozilla/firefox< 140.9.0+1

🔴Vulnerability Details

3
GHSA
GHSA-vcpc-fv28-ppg5: Information disclosure in the Widget: Cocoa component↗2026-03-24
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OSV
CVE-2026-4712: Information disclosure in the Widget: Cocoa component↗2026-03-24
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CVEList
Information disclosure in the Widget: Cocoa component↗2026-03-24
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📋Vendor Advisories

6
Red Hat
firefox: thunderbird: Information disclosure in the Widget: Cocoa component↗2026-03-24
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Debian
CVE-2026-4712: firefox - Information disclosure in the Widget: Cocoa component. This vulnerability affect...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-20: CVE-2026-4712↗
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Mozilla
Mozilla Foundation Security Advisory 2026-24: CVE-2026-4712↗
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Mozilla
Mozilla Foundation Security Advisory 2026-22: CVE-2026-4712↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-4712 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

1
Bugzilla
CVE-2026-4712 firefox: thunderbird: Information disclosure in the Widget: Cocoa component↗2026-03-24
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