Hackers Target Microsoft SharePoint RCE Chain with PoC Exploit
Hackers exploit two Microsoft SharePoint vulnerabilities to execute code, using proof-of-concept exploits.
Intelligence analysis by Qwen 2.5 (3B)
Hackers are targeting a chain of two Microsoft SharePoint vulnerabilities that allow RCE, using proof-of-concept exploits.
Hackers found two ways to trick Microsoft's SharePoint software into letting them do bad things. They can pretend to be someone they're not to get into the system, and then use that trick to run their own code. This is a big deal because many companies use SharePoint to store important stuff, and if someone can trick it, they can do a lot of damage.
Analysis
{"heading_1":"The Vulnerabilities","paragraph_1":"Once attackers have valid credentials, only 37% of their actions are blocked. The Blue Report 2026 measures defenses technique by technique across 338 million simulations run in customer production environments.","paragraph_2":"The report highlights the importance of continuous security hardening and the need for effective prevention measures to mitigate the risks of these vulnerabilities.","paragraph_3":"CISA's warnings and the ongoing exploitation of these vulnerabilities underscore the importance of staying vigilant and implementing robust security measures to protect against such attacks.","heading_2":"Impact and Response","heading_3":"Prevention and Defense","paragraph_4":"Defusing the attack chain requires a multi-layered approach, including regular security audits, timely patching, and enhanced monitoring of SharePoint server activity."}
Key points
- Hackers are exploiting two Microsoft SharePoint vulnerabilities for RCE.
- CVE-2026-55040 is an authentication bypass flaw in JWT token validation.
- CVE-2026-63520 is a vulnerability in SharePoint's Business Connectivity Services (BCS).
- CISA has ordered federal agencies to secure their SharePoint servers against CVE-2026-55040 attacks.
- CISA also warned of the exploitation of three other vulnerabilities in SharePoint Server instances.
By securing their SharePoint servers and keeping them patched, companies can prevent these attacks from happening.
If attackers find new ways to exploit these vulnerabilities, they could cause serious damage to companies' data and operations.
