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Firefox for Android CVE-2026-16397

| EUVDEUVD-2026-46235 MEDIUM
Improper Restriction of Rendered UI Layers or Frames (CWE-1021)
2026-07-21 mozilla GHSA-wc2c-7f6v-vhf3
Google XSS Mozilla Suse Red Hat
Medium
Disputed · 6.5 Vendor: mozilla
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Severity by source

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

Network-delivered clickjacking requires no attacker privileges but demands active user interaction; integrity-only impact with no data disclosure or service disruption.

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

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jul 21, 2026 - 20:26 vuln.today
CVSS changed
Jul 21, 2026 - 20:22 NVD
6.5 (MEDIUM)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
MEDIUM 6.5

DescriptionCVE.org

Clickjacking issue in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 153.

AnalysisAI

Clickjacking (UI redressing) in the WebExtensions component of Firefox for Android allows a network-based attacker to hijack user interactions, resulting in high-integrity impact against the victim's browser session. All Firefox for Android versions prior to 153 are affected; Mozilla has released a fix in Firefox 153. No public exploit code has been identified and this vulnerability is not listed in the CISA KEV catalog at time of analysis.

Technical ContextAI

CWE-1021 (Improper Restriction of Rendered UI Layers or Frames) is the root cause - this is the canonical clickjacking weakness class. The WebExtensions component in Firefox for Android failed to adequately prevent malicious web content from rendering transparent or opaque UI overlay layers atop legitimate browser UI, enabling an attacker-controlled page to intercept and redirect user interactions. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* covers all Firefox versions across platforms, but the description explicitly scopes the vulnerability to the Android platform's WebExtensions subsystem. The tags reference Google and XSS alongside Mozilla, which may indicate cross-origin rendering context involvement, but this cannot be confirmed from the available data.

RemediationAI

Update Firefox for Android to version 153 or later, which contains the vendor-released patch addressing this clickjacking issue. The authoritative fix details are documented in the Mozilla security advisory at https://www.mozilla.org/security/advisories/mfsa2026-68/ and the underlying bug report at https://bugzilla.mozilla.org/show_bug.cgi?id=2047608. As a compensating control prior to patching, users should avoid visiting untrusted or unfamiliar websites on Firefox for Android, since the attack requires the victim to visit an attacker-controlled page and interact with crafted UI elements; this reduces exposure but does not eliminate risk for users who regularly browse arbitrary web content. No additional vendor-recommended workarounds are identified in the available data.

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

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Same technique XSS

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
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
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16397 vulnerability details – vuln.today
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