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Microsoft Under Fire After Major SharePoint Security Breach

Microsoft Under Fire After Major SharePoint Security Breach

Microsoft Under Fire After Major SharePoint Security Breach?w=400
Microsoft is grappling with an alarming security breach affecting its SharePoint collaboration software, impacting organisations and government entities globally.
The Cybersecurity and Infrastructure Security Agency (CISA) recently unveiled the vulnerability, warning that it permits unauthorised access to systems and complete access to SharePoint content, enabling malicious actors to execute code across networks.

While Microsoft has issued security updates for affected SharePoint versions, an older 2016 version remains vulnerable as the company works to develop a patch. Cybersecurity experts at Palo Alto Networks estimated this breach potentially affects thousands of organisations worldwide, highlighting the real and immediate threat posed by these exploits.

The vulnerability is of particular concern as it allows hackers to impersonate users even after patches are applied, according to researchers at Eye Security, a European cybersecurity firm responsible for identifying the flaw. This breach significantly impacts organisations relying on SharePoint for document storage and collaboration.

This security breach raises grave concerns for businesses and governmental bodies relying on SharePoint. The capability to impersonate users and integrate with other Microsoft services such as Outlook and Teams exacerbates the risk, leading to potential data theft, password compromises, and further infiltrations. Eye Security researchers warn that breaches of this nature can escalate rapidly to data exfiltration, deployment of backdoors, and theft of cryptographic keys, presenting a long-term cybersecurity threat to organisations.

The incident underscores the necessity for organisations to remain vigilant and promptly apply available security updates to safeguard their systems. As threats evolve, maintaining robust cybersecurity measures is crucial to mitigating risks and protecting sensitive data from malicious attacks.

Microsoft is actively working to address the vulnerabilities and develop solutions for affected versions of SharePoint. Organisations using on-premises SharePoint servers are urged to install the security updates provided by Microsoft to enhance their defences against such threats.

Meanwhile, cybersecurity experts emphasise the importance of comprehensive security strategies, including regular system updates and employee awareness training, to combat sophisticated cyberattacks. As incidents like this highlight ongoing cybersecurity challenges, maintaining proactive measures and collaboration with security researchers will be vital for organisations to safeguard their digital assets and protect against future threats.

Published:Tuesday, 22nd Jul 2025
Source: Paige Estritori

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