Microsoft SharePoint
Hackers leverage new Microsoft SharePoint exploit in attacks
A proof-of-concept (PoC) exploit for a critical Microsoft SharePoint vulnerability, published by cybersecurity company Rapid7 on Tuesday, is already being used in attacks. Tracked as CVE-2026-55040, this authentication bypass security flaw in the JWT token validation pipeline can be exploited by attackers without privileges to perform operations as a SharePoint site user or administrator. Microsoft patched […]
CISA: Microsoft SharePoint flaw now exploited in ransomware attacks
CISA confirmed today that ransomware gangs have begun abusing a high-severity Microsoft SharePoint remote code execution vulnerability, which has been flagged as actively exploited since early July. Tracked as CVE-2026-45659, this security flaw stems from a deserialization of untrusted data weakness and allows attackers with low privileges to execute arbitrary code on unpatched SharePoint servers. It […]
Swiss government SharePoint breach compromised 200 accounts
Switzerland’s federal IT office says hackers exploited vulnerabilities to breach its Microsoft SharePoint servers and compromised approximately 200 accounts. The Federal Office for Information Technology and Telecommunication (BIT) detected the cyberattack after security specialists noticed unusual activity on its SharePoint servers on July 28. After confirming the breach, BIT blocked external internet access to SharePoint, patched the suspected vulnerabilities, […]
Microsoft 365 outage affects Teams, SharePoint and other services
Microsoft is impacted by a massive outage affecting Teams and Microsoft 365 services, primarily affecting users in North America. At 11:11 AM ET on July 23, Downdetector recorded 2,403 reports, sharply above its normal baseline of 29. SharePoint accounted for 78% of the complaints, followed by Excel at 11% and the Microsoft 365 Admin Center at 6% […]
Critical SharePoint RCE flaw exploited to steal machine keys
Hackers are actively exploiting the critical CVE-2026-50522 vulnerability in Microsoft SharePoint to steal machine keys and maintain access even after affected servers are patched. An attacker obtaining them can create valid authentication tokens to impersonate users and access available resources such as SharePoint sites and documents with the privileges of the forged identity. Microsoft describes the […]
CISA warns admins to patch actively exploited SharePoint flaws
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned Tuesday that attackers are actively exploiting three vulnerabilities to hack Internet-exposed on-premises SharePoint Server instances. These security flaws (tracked as CVE-2026-32201, CVE-2026-45659, and c) affect all supported self-hosted SharePoint Server versions, including SharePoint Server Subscription Edition (the latest on-premises version, which uses a “continuous update” model). […]
CISA: Microsoft SharePoint RCE flaw now actively exploited
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned on Wednesday that attackers have begun exploiting a high-severity Microsoft SharePoint remote code execution vulnerability. Tracked as CVE-2026-45659, this security flaw stems from a deserialization of untrusted data weakness, and it allows attackers with low privileges to execute arbitrary code on unpatched SharePoint servers in low-complexity attacks […]
Hackers earn $1,298,250 for 47 zero-days at Pwn2Own Berlin 2026
The Pwn2Own Berlin 2026 hacking contest has concluded, with security researchers collecting $1,298,250 in rewards after exploiting 47 zero-day flaws. The competition took place at the OffensiveCon conference from May 14 to May 16 and focused on enterprise technologies and artificial intelligence. Throughout the contest, the hackers targeted fully patched products across web browsers, enterprise applications, local […]
Over 1,300 Microsoft SharePoint servers vulnerable to spoofing attacks
Over 1,300 Microsoft SharePoint servers exposed online remain unpatched against a spoofing vulnerability that was exploited as a zero-day and is still being abused in ongoing attacks. The security flaw, tracked as CVE-2026-32201, affects SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition (the latest on-premises version, which uses a “continuous update” model). […]
Critical Microsoft SharePoint flaw now exploited in attacks
A critical Microsoft SharePoint vulnerability patched in January is now being exploited in attacks, the Cybersecurity and Infrastructure Security Agency (CISA) warned. Tracked as CVE-2026-20963, this security flaw affects SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition. Successful exploitation enables threat actors without privileges to achieve remote code execution on unpatched servers […]