Information Disclosure Vulnerability in Firefox by Mozilla
CVE-2026-0883

5.3MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
13 January 2026

What is CVE-2026-0883?

An information disclosure vulnerability exists in the Networking component of Firefox, affecting versions prior to 147 and Firefox ESR versions before 140.7. This flaw may allow unauthorized access to sensitive information, making it crucial for users to update their browsers to ensure protection against potential exploits. For detailed information and mitigation steps, refer to the official Mozilla security advisories.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

Firefox < 147

Firefox ESR < 140.7

Thunderbird < 147

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/

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Vladislav Plyatsok
JSON
.