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Firefox ESR EUVDEUVD-2026-28365

| CVE-2026-8094 CRITICAL
Code Injection (CWE-94)
2026-05-07 mozilla GHSA-5ghx-9783-29rc
Mozilla Code Injection RCE
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
May 09, 2026 - 01:32 vuln.today
CVSS changed
May 08, 2026 - 23:22 NVD
9.8 (CRITICAL)
CVE Published
May 07, 2026 - 12:45 nvd
UNKNOWN (no severity yet)
CVE Published
May 07, 2026 - 12:45 nvd
CRITICAL 9.8

DescriptionCVE.org

Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2.

AnalysisAI

Remote code execution in Firefox ESR's WebRTC component allows unauthenticated network attackers to achieve arbitrary code execution with complete system compromise. The vulnerability affects Firefox ESR versions prior to 140.10.2 and carries a critical CVSS score of 9.8 with network attack vector requiring no authentication or user interaction. Despite the critical severity, EPSS probability remains exceptionally low at 0.01% (0th percentile) with no evidence of active exploitation, suggesting limited awareness or exploitation complexity despite the automatable nature assessed by CISA SSVC framework.

Technical ContextAI

The vulnerability resides in Mozilla Firefox ESR's WebRTC (Web Real-Time Communication) implementation, a framework enabling peer-to-peer audio, video, and data sharing in web browsers. Classified as CWE-94 (Improper Control of Generation of Code / Code Injection), this flaw allows attackers to inject and execute arbitrary code within the WebRTC component. WebRTC operates at the browser's network layer handling real-time media streams and data channels, making code injection vulnerabilities particularly severe as they bypass typical web application sandboxing. The affected product CPE (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) indicates broad version coverage within the Firefox ESR channel, which is Mozilla's extended support release branch designed for enterprise deployments requiring stability over rapid feature updates.

RemediationAI

Upgrade Firefox ESR to version 140.10.2 or later immediately, as confirmed by Mozilla security advisories MFSA2026-41 and MFSA2026-44 available at https://www.mozilla.org/security/advisories/mfsa2026-41/ and https://www.mozilla.org/security/advisories/mfsa2026-44/. For enterprise environments unable to deploy the patch immediately, implement compensating controls targeting the WebRTC attack surface: disable WebRTC functionality entirely via about:config by setting media.peerconnection.enabled to false and media.navigator.enabled to false, which will break legitimate WebRTC applications including video conferencing and browser-based communication tools. Network-level mitigation can restrict WebRTC STUN/TURN traffic by blocking UDP ports 3478 and TCP ports 3478-3479, though this may cause connectivity degradation for authorized WebRTC services. For critical environments, consider temporarily restricting Firefox ESR browser usage to non-internet-facing systems until patching is complete, though this significantly impacts productivity in organizations relying on web-based workflows.

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Same weakness CWE-94 – Code Injection

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Same technique Code Injection

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Server 12 SP5-LTSS Fixed
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed

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EUVD-2026-28365 vulnerability details – vuln.today
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