By The420 Web Correspondent
Publication Date: 2026-09-30 17:40:00
Cisco has released emergency security updates for a critical vulnerability in its Catalyst SD-WAN Manager software after confirming that hackers are actively exploiting the flaw. The security weakness could allow attackers to bypass authentication and gain administrator-level access to affected systems without valid login credentials.
The vulnerability, tracked as CVE-2026-76504, carries a severity score of 9.8 out of 10. Cisco disclosed the issue on September 30, warning that successful exploitation could give an unauthorised attacker extensive access to the network management platform.
Cisco Catalyst SD-WAN Manager is used by organisations to centrally manage and monitor networks connecting offices, data centres and other locations.
The company confirmed that its security response team became aware of active exploitation in September. However, it has not publicly identified the attackers, disclosed the number of affected organisations or provided details about the attacks.
