CVE-2026-0883 — Sensitive Information Exposure in Mozilla Firefox

CWE-200 — Sensitive Information Exposure13 documents10 sources
Severity
5.3MEDIUMNVD
EPSS
0.0%
top 96.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedJan 13
Latest updateFeb 2

Description

Information disclosure in the Networking component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages3 packages

▶NVDmozilla/firefox< 140.7.0+1
▶NVDmozilla/thunderbird< 140.7.0+1
▶Debianmozilla/thunderbird< 1:140.7.0esr-1~deb11u1+3

🔴Vulnerability Details

3
GHSA
GHSA-fqpc-v68g-xp98: Information disclosure in the Networking component↗2026-01-13
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CVEList
Information disclosure in the Networking component↗2026-01-13
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OSV
CVE-2026-0883: Information disclosure in the Networking component↗2026-01-13
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
firefox: thunderbird: Information disclosure in the Networking component↗2026-01-13
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Debian
CVE-2026-0883: firefox - Information disclosure in the Networking component. This vulnerability affects F...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-01: CVE-2026-0883↗
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Mozilla
Mozilla Foundation Security Advisory 2026-03: CVE-2026-0883↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-0883 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-0883 — Sensitive Information Exposure | cvebase