Microsoft SharePoint RCE Bug: A Critical Exploit in Action

Microsoft SharePoint

Microsoft SharePoint RCE Bug: A Critical Exploit in Action

The Cybersecurity and Infrastructure Security Agency (CISA) has recently flagged a critical bug in Microsoft SharePoint. This bug, known as a Remote Code Execution (RCE) exploit, is currently being actively exploited.

Unpacking the Microsoft SharePoint RCE Bug

The SharePoint RCE bug is a code injection vulnerability. It can be chained with a critical privilege escalation flaw for pre-auth remote code execution attacks. This means that attackers can exploit this bug to execute arbitrary code on the SharePoint server.

In other words, an attacker can take control of the server and perform actions as if they were the server’s legitimate operator. This could include actions like data theft, data alteration, or even using the server to launch further attacks. It’s a serious vulnerability that poses a significant risk to any organization using Microsoft SharePoint. That’s why immediate action is needed to mitigate this risk.

The Severity of the Microsoft SharePoint RCE Bug

The bug, tracked as CVE-2023-29357, is an elevation of privilege vulnerability with a CVSS v3 score of 9.8. This score indicates the severity of the bug, with 10 being the highest possible score. The high score of this bug underscores its potential impact.

CISA’s Response to the SharePoint RCE Bug

In response to the active exploitation of the SharePoint RCE bug, CISA has added it to its Known Exploited Vulnerabilities Catalog. This catalog is a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise.

The Importance of Timely Remediation

CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities as part of their vulnerability management practice. This is particularly crucial for the SharePoint RCE bug, given its active exploitation and high severity score.


The active exploitation of the SharePoint RCE bug is a stark reminder of the importance of timely vulnerability management. Organizations using Microsoft SharePoint must take immediate action to mitigate the risk associated with this bug.

In the face of such threats, the role of agencies like CISA becomes even more critical. By flagging such vulnerabilities and urging timely remediation, they play a key role in safeguarding our digital infrastructure.

Remember, in the world of cybersecurity, staying informed and taking prompt action is the best defense.

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