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Mozilla Firefox CVE-2026-74972

| EUVDEUVD-2026-60667 MEDIUM
Information Exposure (CWE-200)
2026-08-18 mozilla GHSA-jq83-8mj9-4343
Information Disclosure Mozilla Red Hat Suse
4.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Network vector confirmed; UI:R reflects mandatory victim page visit; C:L for partial subscription data disclosure with no integrity or availability impact.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 20:30 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
MEDIUM 4.3
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Information disclosure through Firefox's DOM Push Subscriptions component exposes limited confidential data to network-positioned attackers who can induce user interaction. All Firefox releases prior to 154 and both Firefox ESR branches (pre-140.14 and pre-153.1) are affected, with Mozilla issuing at least six security advisories (mfsa2026-74 through mfsa2026-80) addressing this and related issues. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts crafted webpage
Delivery
Victim visits page in unpatched Firefox
Exploit
Page triggers DOM Push Subscriptions API
Execution
Subscription data disclosed to page context
Impact
Attacker exfiltrates sensitive subscription metadata
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to visit a malicious or attacker-influenced webpage using an unpatched Firefox browser, satisfying the user interaction requirement (UI:R). … 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:N/A:N yields a 4.3 Medium score, accurately capturing a flaw that is network-reachable and requires no attacker authentication but depends on victim interaction and carries only limited confidentiality impact with no integrity or availability consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious or compromised webpage that triggers interaction with the DOM Push Subscriptions API when visited by a Firefox user, causing the browser to disclose subscription endpoint data or associated keys to the attacker-controlled page context. The victim must visit the page and interact with it (satisfying the UI:R requirement), after which exfiltrated subscription data could be used to impersonate notification sources or de-anonymize the user. …
Remediation Upgrade to Firefox 154 or later for standard release users, Firefox ESR 140.14 or later for the long-term support 140 branch, or Firefox ESR 153.1 or later for the 153 ESR branch, as confirmed by Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-74/, https://www.mozilla.org/security/advisories/mfsa2026-76/, and https://www.mozilla.org/security/advisories/mfsa2026-77/. … Detailed patch versions, workarounds, and compensating controls in full report.
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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-2026-74972 vulnerability details – vuln.today
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