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Mozilla Firefox CVE-2026-84131

| EUVDEUVD-2026-69067 HIGH
Release of Invalid Pointer or Reference (CWE-763)
2026-09-01 mozilla GHSA-8v78-cgm6-v8h8
Privilege Escalation Mozilla
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network-exploitable via crafted webpage (AV:N, AC:L, PR:N, UI:R); full impact within browser process but no scope change to OS (S:U, C:H/I:H/A:H).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.2 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Sep 01, 2026 - 17:35 vuln.today
CVSS changed
Sep 01, 2026 - 17:22 NVD
8.8 (None) 8.8 (HIGH)
CVE Published
Sep 01, 2026 - 12:18 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 12:18 cve.org
HIGH 8.8

DescriptionCVE.org

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

Articles & Coverage 1

News 7 New Mozilla Vulnerabilities - 2 Critical, 5 High Severity Sep 02, 2026

AnalysisAI

Privilege escalation in Mozilla Firefox's Graphics component via an invalid pointer (CWE-763) exposes users running all Firefox versions prior to 155 and ESR branches prior to 115.40, 140.15, and 153.2 to full compromise of confidentiality, integrity, and availability. The CVSS 8.8 network-vector score with no required privileges but mandatory user interaction (UI:R) places this squarely in the drive-by exploitation category - a victim visiting a crafted webpage is sufficient to trigger the flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to visit a malicious or compromised webpage using an unpatched Firefox browser - this is the sole prerequisite. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) signals a high-severity, network-exploitable flaw requiring no attacker privileges and only a single user interaction - visiting a crafted page. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patches: Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Alert Firefox users to defer browsing untrusted websites pending security updates. …

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Same weakness CWE-763 – Release of Invalid Pointer or Reference

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-84131 vulnerability details – vuln.today
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