CVE-2026-6750: Privilege escalation in the Graphics: WebRender component

Published Apr 21, 2026
·
Updated

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.

Affected Software

9 affected componentsFixes available
Mozilla Firefox ESR<115.35
115.35
Mozilla Firefox ESR<140.10
140.10
Mozilla Firefox<150
150
Mozilla Thunderbird<150
150
Mozilla Thunderbird<140.10
140.10
Mozilla Firefox<115.35.0
Mozilla Firefox<150.0
Mozilla Firefox>=140.0<140.10.0
Mozilla Thunderbird<140.10.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 115.35
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.10
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 150
  4. Upgrade

    Upgrade Mozilla Firefox (and Firefox ESR) / Thunderbird to a version that resolves this vulnerability.

    Fixed in 150
  5. Upgrade

    Upgrade Mozilla Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.35
  6. Upgrade

    Upgrade Mozilla Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.10
  7. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 150
  8. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.10

Event History

Apr 21, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:40 PM
Data Sourced
via MITRE·12:40 PM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected Software
Jan 23, 58467
Event
via NVD·07:01 AM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-6750?

CVE-2026-6750 has been classified as a privilege escalation vulnerability, which could allow unauthorized access to system privileges.

2

How do I fix CVE-2026-6750?

To fix CVE-2026-6750, update to Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, or Thunderbird 140.10.

3

Which versions are affected by CVE-2026-6750?

CVE-2026-6750 affects Firefox versions up to 150, Firefox ESR versions up to 115.35 and 140.10, and Thunderbird versions up to 150 and 140.10.

4

Who is the vendor associated with CVE-2026-6750?

The vendor associated with CVE-2026-6750 is Mozilla.

5

What components are involved in CVE-2026-6750?

CVE-2026-6750 involves the Graphics: WebRender component of Mozilla products.

Company

Resources

Contact

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