CVE-2026-2803 — Sensitive Information Exposure in Mozilla Firefox

CWE-200 — Sensitive Information ExposureCWE-693 — Protection Mechanism Failure9 documents8 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 82.18%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedFeb 24

Description

Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

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 Packages2 packages

▶NVDmozilla/firefox< 148.0
▶NVDmozilla/thunderbird< 148.0

🔴Vulnerability Details

3
CVEList
Information disclosure, mitigation bypass in the Settings UI component↗2026-02-24
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OSV
CVE-2026-2803: Information disclosure, mitigation bypass in the Settings UI component↗2026-02-24
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GHSA
GHSA-7cfj-7vv8-r64h: Information disclosure, mitigation bypass in the Settings UI component↗2026-02-24
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📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Information disclosure, mitigation bypass in the Settings UI component↗2026-02-24
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Debian
CVE-2026-2803: firefox - Information disclosure, mitigation bypass in the Settings UI component. This vul...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2803↗
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Mozilla
Mozilla Foundation Security Advisory 2026-16: CVE-2026-2803↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-2803 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-2803 — Sensitive Information Exposure | cvebase