DevTools Vulnerability in Firefox by Mozilla
CVE-2026-100810

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Thunderbird
Firefox
Vendor
CVE Published:
29 September 2026

What is CVE-2026-100810?

A security issue was discovered in the DevTools component of Firefox. This vulnerability, identified and reported as a critical concern, has been addressed in the latest version, Firefox 157. Users are encouraged to update their browsers to ensure protection against potential attacks exploiting this weakness.

Affected Version(s)

Firefox 157

Thunderbird 157

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2064034
https://www.mozilla.org/security/advisories/mfsa2026-101/
https://www.mozilla.org/security/advisories/mfsa2026-97/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Finn Westendorf
.