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Mozilla Firefox CVE-2026-75874

| EUVDEUVD-2026-60674 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-08-18 mozilla GHSA-xxrc-g5c2-523g
Information Disclosure Mozilla Red Hat Suse
10.0
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
10.0 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
8.3 HIGH

Reached via malicious web content so AV:N/UI:R; a sandbox escape realistically requires chaining and complex conditions, hence AC:H; scope changes to the parent process with full CIA impact.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 20:28 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 18, 2026 - 12:23 cve.org
CRITICAL 10.0

DescriptionCVE.org

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154.

Articles & Coverage 1

News Critical Sandbox Escape in Mozilla Firefox Remote Settings Client - CVE-2026-75874 Aug 19, 2026

AnalysisAI

Sandbox escape in the Remote Settings Client component of Mozilla Firefox lets attacker-controlled code break out of the isolated content process and reach the more privileged parent process, and was resolved in Firefox 154. The flaw is classed as a protection-mechanism failure (CWE-693) and carries a maximal CVSS 3.1 base score of 10.0 with a changed scope, reflecting cross-boundary impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure user to malicious web page
Delivery
Exploit content-process bug
Exploit
Gain code execution in sandbox
Execution
Trigger Remote Settings Client escape
Persist
Break into privileged parent process
Impact
Full cross-scope compromise
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Vulnerability AssessmentAI

Exploitation The vulnerable code path is the Remote Settings Client component, and the 'sandbox escape' framing means the practical prerequisite is prior code execution within a Firefox content/sandbox process - typically obtained by getting the victim to load attacker-controlled web content, which in turn requires a running vulnerable Firefox (any version before 154). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are partially conflicting and should be weighed rather than taken at face value. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker lures a Firefox user to a malicious or compromised web page that first exploits a content-process bug to gain code execution inside the sandbox, then leverages this Remote Settings Client flaw to escape the sandbox into the privileged parent process, achieving control that spans the security boundary (scope change). No public proof-of-concept has been identified, and realistic exploitation depends on chaining with a separate content-process primitive.
Remediation Vendor-released patch: Firefox 154 - upgrade all Firefox installations to version 154 or later, which is the primary and complete remediation per the description and Mozilla advisories (https://www.mozilla.org/security/advisories/mfsa2026-74/ and https://www.mozilla.org/security/advisories/mfsa2026-78/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all Firefox installations across your environment and identify systems accessing sensitive business applications or data; alert IT operations to monitor for unusual Firefox process behavior. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-75874 vulnerability details – vuln.today
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