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Mozilla Firefox CVE-2026-12289

| EUVDEUVD-2026-37080 HIGH
Improper Privilege Management (CWE-269)
2026-06-16 mozilla GHSA-pp33-f8rg-g2pq
Privilege Escalation Mozilla
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Browser flaw triggered by loading malicious web content (AV:N, AC:L, PR:N, UI:R); WebRender privilege escalation yields high C/I/A within the browser process without crossing a security authority (S:U).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
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: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

3
Analysis Generated
Jun 16, 2026 - 15:36 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
8.8 (HIGH)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Articles & Coverage 1

News 5 New Mozilla Vulnerabilities - 5 High Severity, No Public POC Jun 16, 2026

AnalysisAI

Privilege escalation in the WebRender graphics component of Mozilla Firefox enables remote attackers to elevate privileges within the browser sandbox when a victim loads malicious web content. Mozilla has patched the issue in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37, and no public exploit has been identified at time of analysis.

Technical ContextAI

WebRender is Firefox's GPU-accelerated rendering engine, written largely in Rust, which composites web page content using the graphics pipeline. The flaw is classified as CWE-269 (Improper Privilege Management), indicating that WebRender fails to properly enforce or contain the privilege boundary it is meant to operate within - typically the constrained content/GPU process sandbox. Because WebRender processes attacker-controlled rendering instructions derived from web content (CSS, canvas, layers), a logic error in privilege handling can allow code or operations to run with higher privileges than the rendering context should grant. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering Firefox builds prior to the fix releases.

RemediationAI

Vendor-released patch: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37 as documented in Mozilla advisories MFSA-2026-57, MFSA-2026-58, and MFSA-2026-59. Enterprises managing browser fleets via Group Policy, MDM, or configuration management should push the updated builds and verify version reporting from endpoints. Where immediate patching is not possible, compensating controls include restricting browsing to trusted sites via proxy/URL filtering, disabling hardware-accelerated WebRender by setting gfx.webrender.all and gfx.webrender.enabled to false in about:config (note: this degrades rendering performance and may not eliminate the affected code path entirely), and enforcing strict-site-isolation/fission so any compromise stays in a constrained content process.

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Same weakness CWE-269 – Improper Privilege Management

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-12289 vulnerability details – vuln.today
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