CVE-2026-6765
Published: 21 April 2026
Description
Information disclosure in the Form Autofill 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 identifies private personal information in outputs, tangibly reducing the ability to exploit weaknesses that result in its unauthorized exposure.
Privacy-specific attributes and their controlled association directly reduce exposure of private personal information through missing or incorrect labeling.
Preventing nonpublic personal information from public posting reduces unauthorized exposure of private personal data.
The control detects and protects against mining of private personal information, reducing unauthorized exposure of PII.
Privacy literacy training directly targets preventing exposure of personal information through user mishandling.
Tracking locations of sensitive data and access users reduces risk of private personal information exposure.
PIA explicitly identifies PII collection/use/disclosure flows and drives mitigations that reduce the likelihood of unauthorized exposure of private personal information.
The control specifically requires architectures that minimize privacy risk when processing PII, directly addressing exposure of personal information.
Security SummaryAI
CVE-2026-6765 is an information disclosure vulnerability in the Form Autofill component of Mozilla products. It affects Firefox versions prior to 150, Firefox ESR versions prior to 140.10, Thunderbird versions prior to 150, and Thunderbird versions prior to 140.10. The issue, classified under CWE-359 (Exposure of Private Information to an Unauthorized Actor), carries a CVSS v3.1 base score of 5.3, reflecting medium severity with network accessibility, low attack complexity, no privileges or user interaction required, unchanged scope, and low confidentiality impact.
Unauthenticated remote attackers can exploit this vulnerability over the network without user interaction. Successful exploitation allows disclosure of sensitive information stored or handled by the Form Autofill feature, such as autofill data, though the impact is limited to low confidentiality without affecting integrity or availability.
Mozilla Security Advisories (MFSA 2026-30, 32, 33, and 34) and the associated Bugzilla entry detail the fix applied in the specified versions. Mitigation requires updating to Firefox 150, Firefox ESR 140.10, Thunderbird 150, or Thunderbird 140.10, as no additional workarounds are mentioned.
Details
- CWE(s)
Affected Products
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote unauthenticated extraction of browser autofill data (potentially including credentials), directly facilitating local data access and credential harvesting from web browsers.