InfoSecBulletin Cybersecurity for mankind
Microsoft patches to fix a security flaw in SharePoint. This issue could let hackers run harmful code without needing special conditions. The flaw, dubbed CVE-2026-45659, has a CVSS score of 8.8. It is rated as a serious issue.
“Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network,” Microsoft said in an advisory released last week.
Microsoft Patches CVSS 10.0 Azure AI Foundry Vulnerability Allowing Privilege Escalation
AWS is unable to restore access to Bahrain, one UAE cloud data zone after war damage
Cisco Warns of Critical ISE 0-Day Flaw and Hackers Allegedly Selling Fortinet FortiGate 1-Day Flaw
Anthropic prepares “Claude Money” to analyze bank account and financial data
GhostCode Phishing Kit Evades Microsoft 365 MFA to Hijack Accounts in 78 Seconds
CISA Warns of Cisco Secure Email Gateway 0-Day Flaw Actively Exploited in Attacks
VPN flaw exposed 246,000 personnel records in japan
Hackers deploy Casbaneiro Trojan that activates on bank websites
German police read Signal, Telegram, WhatsApp messages without breaking encryption
Urgent Patch! cPanel, GitLab Flaws Expose Users to RCE, File and Credential Theft
Microsoft said that any unauthenticated attacker could cause the vulnerability and it does not need admin or higher permissions.
“In a network-based attack, an authenticated attacker, who has a minimum of Site Member permissions (PR:L), could execute code remotely on the SharePoint Server,” the Windows maker added.
Microsoft thanked a researcher called MEOW for finding and reporting the problem. Updates have been given for these versions –
SharePoint Server Subscription Edition
SharePoint Server 2019
SharePoint Enterprise Server 2016
Last month, Microsoft fixed a security issue with SharePoint Server that allowed fake identities. This flaw, listed as CVE-2026-32201 and rated 6.5 on the CVSS scale, was known to be taken advantage of in real attacks.
The tech giant says CVE-2026-45659 is less likely to be used against users, but it’s still important for users to fix it for better safety. This is especially true because many problems in the platform have often been targeted by attackers in the past.
