Skip to main content

Mozilla Firefox CVE-2026-6762

| EUVDEUVD-2026-24103 MEDIUM
Authentication Bypass by Spoofing (CWE-290)
2026-04-21 mozilla GHSA-h3rr-2q6v-g8rc
Authentication Bypass Mozilla Red Hat Suse
6.3
CVSS 3.1 · NVD
Share

Severity by source

NVD PRIMARY
6.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
SUSE
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 22, 2026 - 16:23 vuln.today
CVSS changed
Apr 22, 2026 - 16:22 NVD
6.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24103
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
MEDIUM 6.3

DescriptionCVE.org

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

DOM spoofing in Firefox allows remote attackers to deceive users about webpage origin and integrity through rendering manipulation, requiring user interaction. Affects Firefox 149 and earlier, Firefox ESR 115.34 and earlier, and Firefox ESR 140.9 and earlier. Fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. EPSS score of 0.02% indicates low exploitation probability despite CVSS 6.3 rating, suggesting practical exploitation constraints despite network accessibility.

Technical ContextAI

The vulnerability exists in Firefox's DOM (Document Object Model) implementation and HTML rendering component, specifically in how the browser validates and displays DOM elements to the user. CWE-290 (Authentication Bypass by Spoofing) indicates the root cause involves inadequate verification of DOM element authenticity or source, allowing an attacker to craft malicious HTML/JavaScript that misrepresents the origin, content, or trustworthiness of page elements. This could manifest as forged visual elements in the DOM tree that mislead users about which webpage they are interacting with or which content originates from trusted sources. The vulnerability affects the core rendering pipeline across all Firefox platforms where DOM element trust indicators are rendered.

RemediationAI

Update Firefox to version 150 or later immediately. Users on Firefox ESR 115 branch should update to version 115.35 or later; those on Firefox ESR 140 should update to version 140.10 or later. Firefox updates are typically applied automatically, but users can verify their current version by naviging to Help > About Firefox (or Firefox > About Firefox on some systems) and allowing automatic updates to complete. No workarounds for users are available; patching is the only remediation. Organizations managing Firefox through group policy (GPO on Windows) or configuration management systems should validate that auto-update is enabled or deploy updates through their management tools. See Mozilla security advisories MFSA2026-30, MFSA2026-31, MFSA2026-32, MFSA2026-33, and MFSA2026-34 for platform-specific guidance.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

Same weakness CWE-290 – Authentication Bypass by Spoofing

View all
CVE-2024-54085 CRITICAL
9.8
CVE-2023-50224 MEDIUM
6.5
CVE-2024-4358 CRITICAL POC
9.8
CVE-2018-5353 CRITICAL POC
9.8
CVE-2023-51350 CRITICAL POC
9.8
CVE-2022-3180 CRITICAL
9.8
CVE-2025-66570 CRITICAL POC
10.0
CVE-2025-49002 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2012-1723 CRITICAL POC
9.8
CVE-2017-10271 HIGH POC
7.5
CVE-2015-1427 CRITICAL POC
9.8
CVE-2025-3248 CRITICAL POC
9.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

Share

CVE-2026-6762 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy