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Mozilla CVE-2026-4717

| EUVDEUVD-2026-14849 CRITICAL
2026-03-24 mozilla GHSA-pqfx-cwf8-965q
Mozilla Privilege Escalation Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14849
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.8

DescriptionCVE.org

Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

Firefox's Netmonitor component contains a privilege escalation vulnerability that affects versions prior to 149 (ESR < 140.9), allowing unauthenticated attackers to gain elevated privileges through network-accessible attack vectors with no user interaction required. This critical flaw (CVSS 9.8) enables complete system compromise including confidentiality, integrity, and availability violations, with no patch currently available.

Technical ContextAI

The vulnerability resides in the Netmonitor debugging component of Firefox, a built-in developer tool used for monitoring network traffic. The affected products are identified via CPE strings cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* and cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*, covering all versions below the patched thresholds. While the specific CWE is not disclosed in available intelligence, privilege escalation vulnerabilities in browser debugging tools typically stem from improper access controls, insufficient input validation, or unsafe inter-process communication (IPC) mechanisms that allow lower-privileged contexts to interact with higher-privileged browser processes.

RemediationAI

Immediately upgrade Mozilla Firefox to version 149 or later, and Firefox ESR to version 140.9 or later. Users should visit https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/ for official patching guidance and download links. For environments where immediate patching is not feasible, restrict access to the Firefox Developer Tools (Netmonitor specifically) via group policy or security policies, and educate users to avoid opening untrusted developer consoles or network monitoring interfaces. Enterprise deployments should prioritize patching given the privilege escalation nature of the flaw and the broad exposure of Firefox across user populations.

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Same technique Privilege Escalation

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Vendor StatusVendor

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) -

SUSE

Severity: Critical
Product Status
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2026-4717 vulnerability details – vuln.today
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