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Multiple Vulnerabilities Discovered in Mozilla Firefox

Multiple Vulnerabilities Discovered in Mozilla Firefox

First seen 30 Sep 2026, 17:30 UTC • •
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ThreatCluster AI
ThreatCluster •September 30, 2026 at 18:35 UTC
  • •Multiple vulnerabilities in Mozilla Firefox allow remote code execution and denial of service.
  • •CVE-2026-100756 was published on September 29, 2026, detailing these vulnerabilities.
  • •Users are urged to apply vendor-issued fixes to mitigate potential exploitation.

Multiple vulnerabilities have been identified in Mozilla Firefox, affecting various components. These vulnerabilities allow remote attackers to exploit them for denial of service, remote code execution, and sensitive information disclosure. Specific vulnerabilities include remote code execution in components like Widget, Graphics, and DOM, as well as denial of service vulnerabilities in Audio/Video and Graphics components. The vulnerabilities were published on September 29, 2026, with a known CVE identifier: CVE-2026-100756. Users are advised to apply fixes issued by the vendor to mitigate these risks. The scope of impact includes all users of Mozilla Firefox who have not yet updated to the latest version.

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Timeline

2026-09-29
CVE-2026-100756 published
Mozilla disclosed multiple vulnerabilities in Firefox, including remote code execution and denial of service risks.
Threats.Kaspersky
2026-09-30
Vulnerabilities reported
HKCERT reported on multiple vulnerabilities in Mozilla Firefox, emphasizing the need for immediate patching.
Hkcert

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Common questions

Which versions of Firefox are affected?
The vulnerabilities affect all versions of Mozilla Firefox prior to the latest patch.
What types of attacks can these vulnerabilities enable?
They can enable remote code execution, denial of service, and sensitive information disclosure.
How can users protect themselves?
Users should apply the latest updates and patches provided by Mozilla to mitigate these vulnerabilities.