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Mozilla Firefox CVE-2026-74983

| EUVDEUVD-2026-60671 HIGH
Protection Mechanism Failure (CWE-693)
2026-08-18 mozilla GHSA-2m2p-42ph-26v7
Authentication Bypass Mozilla Red Hat Suse
High
Disputed · 8.1 Vendor: mozilla
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Severity by source

Sources disagree (Low–High)
Vendor (mozilla) PRIMARY
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vuln.today AI
8.1 HIGH

Network-delivered exploit requiring active user interaction; no auth needed; DLP bypass yields high C and I but no availability impact.

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

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

4
Analysis Generated
Aug 19, 2026 - 16:45 vuln.today
CVSS changed
Aug 19, 2026 - 14:22 NVD
8.1 (HIGH)
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.1
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Protection mechanism failure in Firefox's Data Loss Prevention (DLP) component allows remote attackers, with user interaction, to bypass DLP controls, resulting in high confidentiality and integrity impact. Affected versions span the standard Firefox release channel (prior to 154) and both active ESR branches (ESR 140.x prior to 140.14, ESR 153.x prior to 153.1). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Deliver malicious web content via phishing or web
Exploit
Victim visits and interacts with attacker-controlled page
Execution
Trigger DLP component protection bypass in Firefox
Impact
Exfiltrate sensitive data that DLP would have blocked
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Vulnerability AssessmentAI

Exploitation User interaction is required - the victim must visit or interact with attacker-controlled content (UI:R per CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 8.1 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N) reflects a high-severity network-exploitable flaw requiring no authentication, though user interaction is a necessary prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious web page or delivers content via a phishing link that, when visited by a Firefox user, exploits the DLP bypass to silently exfiltrate sensitive data the browser has processed (e.g., form data, clipboard content, or locally stored credentials) in a manner that Firefox's DLP mechanism would normally detect and block. No public POC is known at the time of analysis, and the attack requires the victim to actively interact with the malicious content.
Remediation Upgrade to Firefox 154 (standard release), Firefox ESR 140.14, or Firefox ESR 153.1 to apply vendor-released patches. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Firefox users running vulnerable versions (standard Firefox prior to 154, ESR 140.x prior to 140.14, ESR 153.x prior to 153.1) and prioritize their patching. …

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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-2026-74983 vulnerability details – vuln.today
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