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Mozilla Firefox EUVDEUVD-2026-37069

| CVE-2026-12323 MEDIUM
Improper Restriction of Rendered UI Layers or Frames (CWE-1021)
2026-06-16 mozilla GHSA-xp8h-82pc-f6jm
Mozilla XSS Suse Red Hat
Medium
Disputed · 5.4 Vendor: mozilla
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Severity by source

Sources disagree (Low–Critical)
Vendor (mozilla) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
vuln.today AI
5.4 MEDIUM

Spoofing enables deceptive integrity impact (UI misrepresentation warrants I:L); no clear availability mechanism justifies A:N over vendor's A:L.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
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:L/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 15:50 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
5.4 (MEDIUM)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152.

AnalysisAI

Spoofing via CWE-1021 (UI layer restriction failure) in Mozilla Firefox's DOM Core & HTML component allows remote unauthenticated attackers to render deceptive UI content in a victim's browser when they interact with a malicious web page. All Firefox versions prior to 152 are affected. No public exploit has been identified at time of analysis, and CISA SSVC assessment classifies exploitation status as none with partial technical impact, placing real-world urgency below the moderate CVSS score suggests.

Technical ContextAI

CWE-1021 (Improper Restriction of Rendered UI Layers or Frames) describes a class of UI-redressing flaws where an application fails to prevent one rendered layer from obscuring or misrepresenting another, enabling clickjacking, iframe overlay, or spoofed browser chrome attacks. The affected component is Firefox's DOM Core and HTML rendering engine - the subsystem responsible for constructing and painting the document object model in the browser viewport. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* indicates all platform variants of Firefox (Windows, macOS, Linux) across all versions prior to the fix. The XSS tag in the intelligence metadata suggests the spoofing may manifest as cross-origin content injection or visual deception consistent with UI redressing rather than classical reflected/stored XSS, though the CWE and description point to a rendering-layer integrity failure as the root cause.

RemediationAI

Vendor-released patch: Firefox 152. Users and administrators should upgrade to Firefox 152 or later, available through the Mozilla update channel or from https://www.mozilla.org/security/advisories/mfsa2026-57/. If immediate upgrade is not feasible, risk can be partially mitigated by restricting users to trusted web content via enterprise browser policies (e.g., allowlisting approved domains), disabling JavaScript for untrusted origins using Firefox's Content Blocking or NoScript extension, or deploying a proxy-layer content policy that blocks known malicious domains - though none of these eliminate the underlying flaw. Organizations managing Firefox via enterprise configuration should consult the MFSA2026-57 advisory to determine whether Firefox ESR is separately affected and requires its own update track. The Bugzilla issue https://bugzilla.mozilla.org/show_bug.cgi?id=2035027 may contain additional technical detail relevant to workaround evaluation.

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Same weakness CWE-1021 – Improper Restriction of Rendered UI Layers or Frames

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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EUVD-2026-37069 vulnerability details – vuln.today
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