What is the CVSS score of CVE-2026-2768?

CVE-2026-2768 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Mozilla are affected by CVE-2026-2768?

A critical sandbox escape vulnerability in Firefox and Thunderbird's IndexedDB component (CVE-2026-2768, CVSS 10.0) allows attackers to bypass browser security isolation and execute arbitrary code…. A patch is available.

Mozilla CVE-2026-2768

Q: How to fix or mitigate CVE-2026-2768?

Within 24 hours: Issue urgent communication advising users to avoid untrusted websites and email attachments until further notice; inventory all Firefox and Thunderbird deployments and versions across the organization. Within 7 days: Deploy browser version pinning policies to prevent auto-updates that might introduce further risks; consider restricting Firefox/Thunderbird usage to non-sensitive tasks only; monitor vendor advisories for patch availability. Within 30 days: Implement mandatory upgrades to patched versions immediately upon availability; conduct forensic review of any suspicious browser activity; reinforce endpoint detection and response (EDR) monitoring for exploitation indicators.

CRITICAL

Improper Access Control (CWE-284)

2026-02-24 security@mozilla.org

Authentication Bypass Mozilla

10.0

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 10, 2026 - 08:30 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 24, 2026 - 14:16 nvd

CRITICAL 10.0

DescriptionNVD

Sandbox escape in the Storage: IndexedDB component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

AnalysisAI

Sandbox escape via IndexedDB in Firefox before 148 and Thunderbird. CVSS 10.0 — the Storage: IndexedDB component allows escaping the content process sandbox.

RemediationAI

Within 24 hours: Issue urgent communication advising users to avoid untrusted websites and email attachments until further notice; inventory all Firefox and Thunderbird deployments and versions across the organization. Within 7 days: Deploy browser version pinning policies to prevent auto-updates that might introduce further risks; consider restricting Firefox/Thunderbird usage to non-sensitive tasks only; monitor vendor advisories for patch availability. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-2768 vulnerability details – vuln.today

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Mozilla CVE-2026-2768

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code