CVE-2026-0883

Information disclosure in the Networking component

State: Published
Severity: 5.3 Medium
Published: Jan 13, 2026
Updated: Apr 13, 2026
Reserved: Jan 13, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
FirefoxMozilla	140.7 through 140.*Not affected 147 and laterNot affected
ThunderbirdMozilla	140.7 through 140.*Not affected 147 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1989340
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://www.mozilla.org/security/advisories/mfsa2026-05/

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