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Mozilla Firefox CVE-2026-8952

| EUVDEUVD-2026-30902 HIGH
Improper Privilege Management (CWE-269)
2026-05-19 mozilla GHSA-hrqc-vwff-62mj
Mozilla Privilege Escalation Suse Red Hat
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Analysis Generated
May 20, 2026 - 17:23 vuln.today
Severity Changed
May 20, 2026 - 17:22 NVD
MEDIUM HIGH
CVSS changed
May 20, 2026 - 17:22 NVD
6.5 (MEDIUM) 8.8 (HIGH)
CVE Published
May 19, 2026 - 12:29 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151.

AnalysisAI

Privilege escalation in Mozilla Firefox via the Application Update component allows remote attackers to gain elevated privileges when a user interacts with malicious content, fixed in Firefox 151. The flaw carries a CVSS 3.1 score of 8.8 (AV:N/AC:L/PR:N/UI:R) and is categorized under CWE-269 (Improper Privilege Management). There is no public exploit identified at time of analysis, and EPSS estimates only a 0.03% probability of exploitation in the next 30 days.

Technical ContextAI

The vulnerability resides in Firefox's Application Update component, the subsystem responsible for fetching, validating, and applying browser updates (typically via the Mozilla updater service/binary that runs with elevated privileges to write to protected program directories). CWE-269 (Improper Privilege Management) indicates that the updater fails to correctly enforce privilege boundaries, allowing a lower-privileged actor to influence operations performed with higher privileges. Affected CPE is cpe:2.3:a:mozilla:firefox covering versions prior to 151 across all platforms where the updater is deployed (primarily Windows and macOS, where the auto-update service runs with elevated rights).

RemediationAI

Vendor-released patch: Firefox 151 - upgrade all Firefox installations to version 151 or later as published in Mozilla advisories MFSA2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/) and MFSA2026-50 (https://www.mozilla.org/security/advisories/mfsa2026-50/). Where immediate patching is not possible, restrict write access to the Firefox install directory and the Mozilla Maintenance Service (on Windows) so unprivileged users cannot stage update payloads, which removes the local elevation surface at the cost of breaking background auto-updates and requiring administrator-driven deployment. Enterprises using policy-managed deployments (Group Policy, MDM, ESR channel) should accelerate the rollout to 151 and verify the updater service is running with least-privilege configuration; consult the Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=2021727 for technical detail once unrestricted.

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Same weakness CWE-269 – Improper Privilege Management

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Same technique Privilege Escalation

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed

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CVE-2026-8952 vulnerability details – vuln.today
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