Security researchers disclosed on August 24–25, 2026, that two Microsoft SharePoint Server vulnerabilities—CVE-2026-55040 and CVE-2026-63520—can be chained to bypass authentication and achieve remote code execution without a password. Both flaws are listed in CISA's Known Exploited Vulnerabilities catalog with public exploits available.
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Chaining CVE-2026-55040 and CVE-2026-63520 for full auth bypass-to-RCE in Microsoft SharePoint: https://www. vulncheck.com/blog/cve-2026-63 520-sharepoint-unsafe-type-rce
New. Rapid7 Analysis: Microsoft SharePoint Remote Code Execution (CVE-2026-63520) https://www. rapid7.com/blog/post/ra-micros oft-sharepoint-remote-code-execution-cve-2026-63520/ @ Rapid7Official # infosec # Microsoft # vulnerability # threatresearch # SharePoint
New. VulnCheck: Exploiting SharePoint: CVE-2026-55040 and CVE-2026-63520 RCE Chain https://www. vulncheck.com/blog/cve-2026-63 520-sharepoint-unsafe-type-rce @ vulncheck # infosec # threatresearch # Microsoft # SharePoint # vulnerability
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Security researchers warned that attackers can chain two Microsoft SharePoint Server vulnerabilities to execute code remotely on vulnerable servers without a password [cybersecuritynews.com#1][cybersecuritydive.com#1]. The chain combines CVE-2026-55040, a CVSS 9.1 authentication-bypass flaw in SharePoint’s JWT authentication handler, with CVE-2026-63520, a remote-code-execution flaw affecting Busi
🚨 Two Microsoft SharePoint vulnerabilities CVE-2026-55040 + CVE-2026-63520 can be chained to bypass authentication and achieve remote code execution. The flaws are in CISA’s KEV catalog, a public PoC is available, and patches are available. Censys sees 329,000 Internet-facing SharePoint servers. Read the advisory: https:// censys.com/advisory/cve-2026-5 5040-cve-2026-63520/ # Cybersecurity # Shar