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Mozilla Firefox EUVDEUVD-2026-30914

| CVE-2026-8963 HIGH
Authentication Bypass by Spoofing (CWE-290)
2026-05-19 mozilla GHSA-7f47-q24v-32rc
Authentication Bypass Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–High)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
vuln.today AI
4.3 MEDIUM

Remote unauthenticated web content, but requires the victim to visit a page (UI:R) and impact is a limited spoofing/integrity effect (I:L), no C or A.

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

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 17:40 vuln.today
CVE Published
May 19, 2026 - 12:30 nvd
UNKNOWN (no severity yet)
CVE Published
May 19, 2026 - 12:30 cve.org
HIGH 7.5

DescriptionCVE.org

Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151.

AnalysisAI

Spoofing in the Firefox Web Speech component allows remote attackers to misrepresent content to users, undermining integrity of speech-driven interactions (CWE-290, spoofing/authentication-bypass class). It affects Firefox versions prior to 151 and is fixed in Firefox 151; no public exploit identified at time of analysis, and EPSS is very low at 0.03%.

Technical ContextAI

The flaw lives in the Web Speech API implementation, the browser subsystem that provides speech synthesis (text-to-speech) and speech recognition to web content via JavaScript. The CWE-290 classification (Authentication Bypass by Spoofing) indicates the component can be induced to present or accept content in a way that misrepresents its true origin or identity, letting a malicious page spoof what the user perceives as trusted output. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* scopes this to the Firefox application across affected versions, with the fix landing in the 151 release train.

RemediationAI

Vendor-released patch: Firefox 151 - upgrade all Firefox installations to 151 or later, which is the primary and complete fix per Mozilla advisories mfsa2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/) and mfsa2026-50 (https://www.mozilla.org/security/advisories/mfsa2026-50/). Enterprise and Linux-distribution users should pull the corresponding SUSE and Red Hat security updates for their packaged Firefox. If immediate patching is not possible, a targeted compensating control is to disable the Web Speech API by setting media.webspeech.synth.enabled (and, where present, media.webspeech.recognition.enable) to false in about:config or via enterprise policy; the trade-off is that legitimate text-to-speech/speech-recognition features and accessibility tooling relying on them will stop working until the browser is updated.

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Same weakness CWE-290 – Authentication Bypass by Spoofing

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Same technique Authentication Bypass

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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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EUVD-2026-30914 vulnerability details – vuln.today
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