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Firefox CVE-2026-74966

| EUVDEUVD-2026-60686 HIGH
Exposure of Private Personal Information to an Unauthorized Actor (CWE-359)
2026-08-18 mozilla GHSA-79c9-ggp3-hgmx
Information Disclosure Mozilla
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Browser autofill disclosure requires a victim to visit a malicious page, supporting UI:R over the vendor-submitted UI:N; no integrity or availability impact applies.

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

Lifecycle Timeline

4
Analysis Generated
Aug 20, 2026 - 18:30 vuln.today
CVSS changed
Aug 20, 2026 - 18:22 NVD
7.5 (HIGH)
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 7.5
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

AnalysisAI

Information disclosure in Firefox's Form Autofill component exposes sensitive personal data stored by the browser to unauthorized actors via a network-accessible, unauthenticated attack path scored CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/C:H). All Firefox versions prior to 154 and Firefox ESR versions prior to 153.1 are affected, with Mozilla issuing four separate security advisories (mfsa2026-74, mfsa2026-77, mfsa2026-78, mfsa2026-80) across release channels. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious web page
Delivery
Victim visits page in unpatched Firefox
Exploit
Form Autofill component incorrectly exposes stored profile data
Execution
Attacker script reads personal information
Impact
Sensitive user data exfiltrated to attacker-controlled infrastructure
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Vulnerability AssessmentAI

Exploitation Any Firefox installation prior to version 154 (or ESR prior to 153.1) is in scope when the user has stored data in Firefox's Form Autofill system, which is enabled by default in standard consumer installations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.5 High rating is driven by a network-accessible, unauthenticated, low-complexity vector with no user interaction required and high confidentiality impact, representing a worst-case autofill disclosure scenario. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A threat actor hosts a malicious or compromised web page designed to trigger the Form Autofill disclosure bug when loaded by a Firefox user with saved autofill data. The attacker's page-level script accesses or exfiltrates personal profile data - names, addresses, or payment details - stored in the browser's autofill store, without requiring the user to take any explicit action beyond visiting the page. …
Remediation Upgrade to Firefox 154 or later, or Firefox ESR 153.1 or later, which are the vendor-confirmed patched releases per Mozilla advisories mfsa2026-74 and mfsa2026-77 (https://www.mozilla.org/security/advisories/mfsa2026-74/ and https://www.mozilla.org/security/advisories/mfsa2026-77/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Firefox browser deployments across the organization and identify users with Form Autofill enabled; simultaneously establish monitoring for exploitation attempts targeting Firefox systems and send a user awareness notification of the vulnerability. …

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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-2026-74966 vulnerability details – vuln.today
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