CVE-2026-8961

MediumCVSS 6.5

Published: 19/05/2026(UTC)Updated: 23/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.32%

25th percentile - higher than 25% of all known CVEs

Summary

A Spoofing vulnerability in the Form Autofill component of Firefox and Thunderbird. The issue was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Risk Assessment

The risk involves potential spoofing of legitimate forms, which could lead to theft of personal data or other sensitive information.

Recommendation

Update Firefox to version 151 or later, Thunderbird to version 151 or later, and Firefox ESR to version 140.11.

Other vulnerabilities in Firefox

See all

CVE-2026-92079Critical
Mitigation bypass vulnerability in the Widget: Win32 component. It was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92075Critical
Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92071Critical
Sandbox escape vulnerability due to incorrect boundary conditions in the Widget: Win32 component. It was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92066Critical
Sandbox escape in the Profile Backup component of Firefox and Thunderbird. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
CVE-2026-92061Critical
Incorrect boundary conditions in the Security: Process Sandboxing component. Fixed in Firefox 156 and Thunderbird 156.
CVE-2026-92057Critical
Mitigation bypass vulnerability in the Enterprise Policies component. It was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92051Critical
Spoofing issue due to invalid pointer in the Graphics component. Fixed in Firefox 156 and Thunderbird 156.
CVE-2026-92048Critical
Sandbox escape vulnerability due to incorrect boundary conditions in the Widget: Win32 component. It was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92045Critical
Sandbox escape vulnerability due to incorrect boundary conditions in the WebRTC component. It was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVE-2026-92037Critical
Incorrect boundary conditions in the DOM: Animation component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Original NVD description (English source)

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS