CVE-2026-2768

moderate-risk

Published 2026-02-24

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

Do I need to act?

0.10% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 10.0/10 Critical

NETWORK / LOW complexity

Affected Products (4)

Firefox

Thunderbird

Affected Vendors

Mozilla

References (5)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=2014101

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2026-13/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2026-15/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2026-16/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2026-17/

/ 100

moderate-risk

Severity 33/34 · Critical

Exploitability 0/34 · Minimal

Exposure 10/34 · Low