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Mozilla Firefox CVE-2026-84124

| EUVDEUVD-2026-69073 MEDIUM
Use After Free (CWE-416)
2026-09-01 mozilla GHSA-668r-xjh4-3hm3
Information Disclosure Memory Corruption Use After Free Mozilla Suse
5.4
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
vuln.today AI
4.2 MEDIUM

UAF exploitation in Firefox's DOM engine requires specific heap layout conditions to be reliably triggered, warranting AC:H over the vendor's AC:L.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
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
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Analysis Generated
Sep 01, 2026 - 15:53 vuln.today
CVSS changed
Sep 01, 2026 - 15:22 NVD
5.4 (MEDIUM)
CVE Published
Sep 01, 2026 - 12:18 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 12:18 cve.org
MEDIUM 5.4

DescriptionCVE.org

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.

AnalysisAI

Use-after-free memory corruption in Firefox's DOM Core and HTML component allows a remote attacker to achieve limited confidentiality and integrity impact against users running unpatched Firefox versions by directing them to a crafted webpage. All Firefox releases prior to version 155, ESR 140.15, and ESR 153.2 are affected; Mozilla has shipped fixes across all three release channels. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a user to visit a malicious or compromised webpage using an unpatched Firefox installation (any version prior to Firefox 155, ESR 140.15, or ESR 153.2). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N scores 5.4 Medium, reflecting low-complexity network delivery that requires user interaction - visiting a malicious page - but no credentials. … 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 Upgrade to Mozilla Firefox 155 or later, Firefox ESR 140.15 or later, or Firefox ESR 153.2 or later, as confirmed by Mozilla security advisories mfsa2026-82, mfsa2026-84, and mfsa2026-85. … Detailed patch versions, workarounds, and compensating controls in full report.
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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-2026-84124 vulnerability details – vuln.today
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