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Firefox for Android CVE-2026-8951

| EUVDEUVD-2026-30903 MEDIUM
Authentication Bypass by Spoofing (CWE-290)
2026-05-19 mozilla GHSA-p3qw-gcrh-3pq6
Authentication Bypass Google Mozilla
6.5
CVSS 3.1 · NVD
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Severity by source

NVD 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-served spoofing requires user navigation (UI:R), no privileges; integrity-only impact with no confidentiality or availability effect.

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
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 17:45 vuln.today
CVE Published
May 19, 2026 - 12:29 nvd
UNKNOWN (no severity yet)
CVE Published
May 19, 2026 - 12:29 cve.org
MEDIUM 6.5

DescriptionCVE.org

Spoofing issue in the Toolbar component in Firefox for Android. This vulnerability was fixed in Firefox 151.

AnalysisAI

Toolbar component spoofing in Firefox for Android allows a remote unauthenticated attacker to mislead users about the origin or security state of a web page, achieving high integrity impact without confidentiality or availability consequences. The vulnerability affects Firefox for Android versions prior to 151 and is classified under CWE-290 (Authentication Bypass by Spoofing), meaning the Toolbar UI element can be manipulated to present false trust signals. No public exploit exists and no active exploitation has been confirmed; Mozilla released a fix in Firefox 151, and the advisory is published at mfsa2026-46.

Technical ContextAI

The affected component is the Toolbar in Firefox for Android - the UI strip that displays the URL bar, security lock icon, and site identity indicators. CWE-290 (Authentication Bypass by Spoofing) indicates that an attacker can forge or manipulate visual trust cues that users rely upon to verify site identity or connection security. On mobile browsers, the URL bar and surrounding chrome are especially critical because screen real estate constraints limit how much security context is visible. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* encompasses all Firefox versions without platform restriction in NVD, though the description explicitly scopes impact to the Android variant. This class of spoofing flaw (CWE-290) is distinct from XSS or injection - it exploits the trust users place in browser chrome rather than web content.

RemediationAI

The primary remediation is to upgrade Firefox for Android to version 151 or later, as confirmed by Mozilla's security advisory mfsa2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/). Updates are distributed through the Google Play Store and Mozilla's own release channels. Organizations managing Android fleets via MDM should push the update to Firefox 151 promptly. If immediate patching is not possible, a compensating control is to restrict or block user access to untrusted web content via enterprise browser policy or network-layer filtering, though this carries the trade-off of reduced browsing capability. Disabling or replacing Firefox for Android with an alternative browser on managed devices is a temporary but operationally disruptive mitigation. No workaround is available that neutralizes the Toolbar spoofing without updating the browser itself.

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Vendor StatusVendor

SUSE

Severity: Medium
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-2026-8951 vulnerability details – vuln.today
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