Name: CVE-2026-2768: Improper Access Control
Creator: Rapid7
Published: 2026-02-24T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-2768, CWE-284, CWE-693, CVSS 10, EPSS 0.00568

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

CVSS Details

CVSS 3.1 Base Score: 10
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11	Feb 27, 2026	Feb 25, 2026
Amazon Linux Ami 2	—	Upgrade firefoxUpgrade thunderbird	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade firefoxUpgrade firefox-debugsourceUpgrade firefox-debuginfo	Mar 27, 2026	Feb 24, 2026
Debian	—	Upgrade firefox-esrUpgrade thunderbird	Feb 27, 2026	Feb 27, 2026
Mfsa2026 13	—	Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 148.0	Feb 25, 2026	Feb 24, 2026
Mfsa2026 15	—	Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 140.8	Feb 25, 2026	Feb 24, 2026
Mozilla Thunderbird	—	Upgrade to Mozilla Thunderbird version 140.8Upgrade to the latest version of Mozilla Thunderbird	Feb 25, 2026	Feb 24, 2026
Oracle_linux	—	Upgrade firefox-x11Upgrade firefoxUpgrade thunderbird	Feb 27, 2026	Feb 24, 2026
Redhat_linux	—	Upgrade thunderbird-debugsourceUpgrade firefox-debugsourceNo solution existsUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbirdUpgrade firefox-x11Upgrade thunderbird-debuginfo	Feb 26, 2026	Feb 24, 2026
Rocky_linux	—	Upgrade thunderbird-debugsourceUpgrade firefox-x11Upgrade firefoxUpgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfo	Mar 2, 2026	Feb 26, 2026
Suse	—	Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbirdUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-other	Mar 10, 2026	Feb 26, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence