Mondoo Vulnerability Intelligence

Curated by Mondoo Research, enhanced with AI

Resources

Search Vulnerabilities
Trending CVEs
Browse Ecosystems
Terminology
Blog

Open Source

cnquery
cnspec

Star us on GitHub!

Company

Mondoo Platform
About
Contact

Vulnerability Intelligence

Customers

Vulnerability IntelligenceCVE-2026-0877

CVE-2026-0877

HIGH8.1

Mitigation bypass in the DOM: Security component

Published Jan 13, 2026

Modified 5 days ago

Fix available

Details

Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

Affected Packages

Firefox

Ubuntu 14.04 LTSUbuntu 16.04 LTSUbuntu 18.04 LTSUbuntu 20.04 LTSUbuntu 22.04 LTS

Fixed in:

147

Mozilla Firefox

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

147

Mozilla Firefox ESR

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

115.32

Mozilla Firefox ESR

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

140.7

Firefox ESR

macOS 14macOS 15macOS 26

Fixed in:

115.32

Firefox ESR

macOS 14macOS 15macOS 26

Fixed in:

140.7

References

WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=1999257 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-0877 WEBhttps://www.mozilla.org/security/advisories/mfsa2026-01/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-02/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-03/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-04/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-05/

CVSS Analysis

CVSS v3.1

8.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

8.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Ecosystems(28)

Ubuntu 14.04 LTS Ubuntu 16.04 LTS Ubuntu 18.04 LTS Ubuntu 20.04 LTS Ubuntu 22.04 LTS

Timeline

PublishedJan 13, 2026

ModifiedJan 15, 2026

CVE-2026-0877 | Mondoo Vulnerability Intelligence