Microsoft disclosed a vulnerability, CVE-2025-26633, affecting the Microsoft Management Console (MMC). A known threat actor called EncryptHub is exploiting it. Read this Cybersecurity Threat Advisory to learn how to mitigate your risks from this zero-day vulnerability.
What is the threat?
CVE-2025-26633, with a CVSSv3 score of 7.0, is a security feature bypass vulnerability in the Microsoft Management Console (MMC). It allows attackers to bypass local security features by convincing users to open malicious files. This vulnerability arises from improper validation of input within the MMC framework. A successful exploitation can enable unauthorized access or execution of malicious actions, potentially compromising the system’s integrity.
Why is it noteworthy?
MMC is used across various Windows environments. The vulnerability becomes especially concerning when combined with social engineering tactics, as attackers can exploit it by convincing users to interact with malicious files. While there are no reports of widespread exploitation yet, the risk posed by this vulnerability is significant for organizations relying on MMC to manage critical systems.
Microsoft acknowledged and addressed the issue in their March 2025 Patch Tuesday update. This emphasizes the importance of prompt patching and continuous monitoring in reducing exposure to similar threats.
What is the exposure or risk?
Organizations using MMC are at risk. Successful exploitation enables attackers to gain unauthorized access and perform malicious actions, including data breaches, disruption of critical systems, and potentially lateral movements.
What are the recommendations?
Barracuda recommends the following actions to address this vulnerability:
- Apply the March 2025 Microsoft Patch Tuesday update at the earliest availability.
- Provide security awareness education, including social engineering risks, to users.
- Review and enhance endpoint protection policies.
- Monitor systems for any unusual activity following the patch update.
Resources
For more in-depth information about the threat, please visit the following links:
- https://nvd.nist.gov/vuln/detail/CVE-2025-26633
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-26633
- https://www.bleepingcomputer.com/news/security/encrypthub-linked-to-zero-day-attacks-targeting-windows-systems/
- https://thehackernews.com/2025/03/encrypthub-exploits-windows-zero-day-to.html
If you have any questions about this Cybersecurity Threat Advisory, don’t hesitate to get in touch with Barracuda Managed XDR’s Security Operations Center.
