CVE-2026-6750

CRITICAL

Privilege escalation in the Graphics: WebRender component

Title source: cna

Description

Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

References (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=2023407

https://www.mozilla.org/security/advisories/mfsa2026-30/

https://www.mozilla.org/security/advisories/mfsa2026-31/

https://www.mozilla.org/security/advisories/mfsa2026-32/

https://www.mozilla.org/security/advisories/mfsa2026-33/

https://www.mozilla.org/security/advisories/mfsa2026-34/

Scores

CVSS v3 9.8

EPSS 0.0004

EPSS Percentile 13.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-269

Status published

Products (8)

mozilla/firefox < 115.35.0

mozilla/firefox < 150.0

Mozilla/Firefox 115.35 - 115.*

Mozilla/Firefox 140.10 - 140.*

Mozilla/Firefox 150

mozilla/thunderbird < 140.10.0

Mozilla/Thunderbird 140.10 - 140.*

Mozilla/Thunderbird 150

Published Apr 21, 2026

Tracked Since Apr 21, 2026