Is Firefox affected by CVE-2026-4718?

CVE-2026-4718 presents notable security risk rated CVSS 8.1. Successful exploitation could significantly impact the confidentiality, integrity, or availability of affected systems. Organizations should apply vendor updates when available and consider compensating controls in the interim.

CVE-2026-4718

Q: How to fix CVE-2026-4718?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

EUVD-2026-14851 HIGH

2026-03-24 mozilla

GHSA-9r85-xf24-6724

8.1

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch Released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 24, 2026 - 12:45 vuln.today

EUVD ID Assigned

Mar 24, 2026 - 12:45 euvd

EUVD-2026-14851

CVE Published

Mar 24, 2026 - 12:30 nvd

HIGH 8.1

Description

Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

Analysis

An undefined behavior vulnerability exists in the WebRTC Signaling component of Mozilla Firefox and Firefox ESR, potentially leading to information disclosure. This affects Firefox versions below 149 and Firefox ESR versions below 140.9. …

Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +40

POC: 0

Vendor Status

Debian

firefox

Release	Status	Fixed Version	Urgency
sid	vulnerable	148.0.2-1	-
(unstable)	fixed	(unfixed)	-

firefox-esr

Release	Status	Fixed Version	Urgency
bullseye	vulnerable	115.14.0esr-1~deb11u1	-
bullseye (security)	vulnerable	140.8.0esr-1~deb11u1	-
bookworm	vulnerable	128.14.0esr-1~deb12u1	-
bookworm (security)	vulnerable	140.8.0esr-1~deb12u1	-
trixie (security), trixie	vulnerable	140.8.0esr-1~deb13u1	-
forky, sid	vulnerable	140.8.0esr-1	-
(unstable)	fixed	(unfixed)	-

CVE-2026-4718 vulnerability details – vuln.today

Back

CVE-2026-4718

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Remediation

Analysis

Full analysis requires sign-in

Priority Score

Vendor Status

Debian

Share

CVE-2026-4718

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Remediation

Full analysis requires sign-in

Priority Score

Vendor Status

Debian

Share

External POC / Exploit Code