CVE-2026-6770
Published: 21 April 2026
Description
Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Automated marking applies security attributes to system outputs, making it harder for attackers to exploit unmarked sensitive information leading to unauthorized exposure.
Proper attribute retention and permitted-value enforcement limits unauthorized actors from accessing sensitive information lacking correct labels.
Prevents unauthorized exposure of sensitive information by prohibiting untrusted external systems from processing or storing it.
By enforcing authorization matching prior to sharing, the control reduces the risk of exposing sensitive information to unauthorized actors.
Review and removal of nonpublic information from publicly accessible systems directly prevents exposure of sensitive data to unauthorized actors.
Data mining protection mechanisms detect and block unauthorized bulk extraction of sensitive data, directly mitigating exposure to unauthorized actors.
Literacy training teaches users to recognize and avoid actions that result in unauthorized exposure of sensitive information.
Retaining and monitoring training records confirms personnel have completed privacy and security awareness training on handling sensitive data, reducing the chance of unauthorized exposure due to lack of knowledge.
Security SummaryAI
CVE-2026-6770 is an unspecified issue in the Storage: IndexedDB component of Mozilla Firefox and Thunderbird products. Published on 2026-04-21, it carries a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L) and is associated with CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Remote attackers require no privileges or user interaction to exploit this network-accessible vulnerability. Successful exploitation could result in low-impact confidentiality loss, such as exposure of sensitive information, and low-impact availability disruption.
Mozilla's security advisories MFSA2026-30, MFSA2026-32, MFSA2026-33, and MFSA2026-34, along with Bugzilla entry 2024220, detail the issue. Mitigation requires updating to the patched releases: Firefox 150 or later, Firefox ESR 140.10 or later, Thunderbird 150 or later, or Thunderbird 140.10 or later.
Details
- CWE(s)
Affected Products
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
IndexedDB storage component vulnerability directly enables unauthorized local data access and sensitive information exposure (CWE-200) from the client system without authentication or interaction.