SharePoint Vulnerability Exploited in Active Attacks

The Hacker News reported on 2nd July 2026 about a critical vulnerability in Microsoft SharePoint Server, identified as CVE-2026-45659, which has been actively exploited. This remote code execution flaw arises from the deserialization of untrusted data and poses a significant risk to organisations using SharePoint.

Why this matters for UK organisations

For UK businesses that rely on SharePoint for collaboration and document management, this vulnerability underscores the importance of timely patching and vulnerability management. Exploitation could lead to unauthorised access and data breaches, impacting business operations and compliance. Ensuring that SharePoint servers are up-to-date with the latest security patches is critical to prevent exploitation.

What to review

Organisations should prioritise their patch management processes, ensuring that all SharePoint servers are updated with the latest security patches. Regular vulnerability assessments and penetration testing can help identify and address potential weaknesses. Implementing a robust incident response plan is also essential to quickly mitigate any potential breaches.

Source: The Hacker News