Improper Certificate Validation in Visual Studio - CVE-2026-118147

Vulnerability details

The vulnerability allows a remote attacker to spoof a network resource and read or modify highly sensitive information exchanged with it.

The vulnerability exists due to improper certificate validation in Visual Studio when establishing network communications. A remote attacker can position themselves in the logical network path between the target and the resource requested by the victim to perform a machine-in-the-middle attack and read or modify network communications.

Affected software

How to mitigate CVE-2026-118147

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-118147
• https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes

Related Security Bulletins

• Improper Certificate Validation in Visual Studio