Insertion of Sensitive Information Into Sent Data in Microsoft products - CVE-2026-66822

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information, including credentials.

The vulnerability exists due to insertion of sensitive information into sent data in .NET when sending data over a network. A remote attacker can access exposed data to disclose sensitive information, including credentials.

Successful exploitation requires specific protocol settings or configurations to be in place.

Affected software

How to mitigate CVE-2026-66822

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-66822

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows