Privilege Escalation in Firefox WebRender Component
CVE-2026-12289

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
16 June 2026

What is CVE-2026-12289?

A vulnerability exists in the Graphics: WebRender component of Firefox that allows for privilege escalation. This issue has the potential to enable attackers to gain elevated permissions, which could compromise system integrity. Mozilla has since addressed this issue in Firefox version 152, as well as in Firefox ESR versions 140.12 and 115.37. Users are encouraged to update their browsers to ensure compliance with security standards and protect against potential exploits.

Affected Version(s)

Firefox 115.37

Firefox 140.12

Firefox 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2023443
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-58/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

choeseyeong
.