Vulnary
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Critical· 9.8official fix available

CVE-2026-8094

A critical flaw in the WebRTC component of Mozilla Firefox and Thunderbird allows attackers to run arbitrary code without any user interaction. The vulnerability is fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.

publishedMay 7, 2026
last modifiedJul 28, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
37th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 27, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Mozilla Firefox (ESR) and Mozilla Thunderbird users who have not updated to version 140.10.2 or later.

02

Real-world impact

An attacker could take full control of a victim’s computer, steal data, install malware, or use the system for further attacks, all without the user noticing.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw can be exploited remotely, requires no authentication or user interaction, and grants complete compromise of confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Firefox ESR to version 140.10.2 or later.
  2. 02Upgrade Thunderbird to version 140.10.2 or later.
  3. 03Restart the applications to ensure the update takes effect.

NVD-referenced vendor advisory

05

Timeline

  1. May 7, 2026 · May 7, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 28, 2026 · 8d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 28, 2026 · 7d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →