Spoofing Vulnerability in Web Speech Component of Firefox
CVE-2026-8963

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8963?

A vulnerability in the Web Speech component of Firefox allows attackers to impersonate users by spoofing speech-related actions. This issue impacts Firefox versions up to and including version 150. Mozilla has addressed and patched this vulnerability in Firefox version 151, enhancing the security of the Web Speech framework and user interactions involving speech recognition.

Affected Version(s)

Firefox 151

Thunderbird 151

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2021222
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-50/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Qadhafy Muhammad Tera
.