Microsoft’s September 2026 Patch Tuesday addresses 964 CVEs, including 104 rated Critical and 860 rated Important, making it the company’s largest Patch Tuesday release on record.
Microsoft lists 974 CVEs in its full September security release. However, 10 of those affect cloud services or involve fixes that Microsoft applies itself, leaving 964 vulnerabilities that customers need to patch.
The release includes fixes for two actively exploited Windows zero-days. Both are local elevation-of-privilege vulnerabilities that could allow an attacker who already has access to a device to gain SYSTEM privileges. Neither provides remote access by itself, but SYSTEM-level access is valuable to malware operators after they gain an initial foothold through phishing, stolen credentials, or another method.
Read more…
Source: MalwareBytes Labs
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- CISA Directs Federal Agencies to Identify and Mitigate Potential Compromise of Cisco Devices
September 25, 2025
Today, CISA issued Emergency Directive ED 25-03: Identify and Mitigate Potential Compromise of Cisco Devices to address vulnerabilities in Cisco Adaptive Security Appliances (ASA) and Cisco Firepower devices. CISA has added vulnerabilities CVE-2025-20333 and CVE-2025-20362 to the Known Exploited Vulnerabilities Catalog. The Emergency Directive requires federal agencies to identify, analyze, and mitigate potential compromises immediately. Agencies ...
- US federal agency breached by hackers using GeoServer exploit
September 24, 2025
In mid-July 2024, a threat actor managed to break into a US Federal Civilian Executive Branch (FCEB) agency by exploiting a critical remote code execution (RCE) vulnerability in GeoServer, the government has confirmed. In an in-depth report detailing the incident, the US Cybersecurity and Infrastructure Security Agency (CISA) outlined how the attackers leveraged CVE-2024-36401, a 9.8/10 ...
- This Is How Your LLM Gets Compromised
September 24, 2025
Plainly speaking, Artificial intelligence is no longer a fringe technology. It has become a core component of modern business, from customer service chatbots to complex data analysis. We often treat the Large Language Models (LLMs) that are at the core of this technology as trusted black boxes. But like any software, they can be tampered with, ...
- Serious Microsoft Entra flaw could have let hackers infiltrate any user – patch now
September 22, 2025
Security researchers have found a critical vulnerability in Microsoft Entra ID which could have allowed threat actors to gain Global Administrator access to virtually anyone’s tenant – without being detected in any way. The vulnerability consists of two things – a legacy service called “actor tokens”, and a critical Elevation of Privilege bug tracked as CVE-2025-55241. ...
- WatchGuard warns users Firebox firewalls may have a critical issue
September 19, 2025
WatchGuard has fixed a critical-severity vulnerability affecting its Firebox firewalls and is urging users to apply the newly released patch without hesitation. In a security advisory, the company said it addressed an out-of-bounds write vulnerability in the WatchGuard Fireware OS iked process, which “may allow a remote unauthenticated attacker to execute arbitrary code”. The vulnerability was ...
- CVE-2025-10035 – Critical unauthenticated RCE in GoAnywhere MFT
September 19, 2025
On September 18, 2025, Fortra published an advisory for CVE-2025-10035. This new vulnerability affects GoAnywhere MFT, an enterprise managed file transfer solution, and allows an attacker to achieve unauthenticated remote code execution. GoAnywhere MFT is a file transfer solution that has been exploited in-the-wild in the past. In 2023, CVE-2023-0669 was exploited in-the-wild as a zero-day, ...