A zero-day vulnerability in Cisco's Catalyst SD-WAN Manager, tracked as CVE-2026-20262, has been exploited by attackers, allowing them to write arbitrary files. Cisco has become aware of the exploitation and has issued a patch to address the issue. The vulnerability enables attackers to gain control over affected systems, posing a significant risk to organizations using the SD-WAN solution. The exploitation status of CVE-2026-20262 is being closely monitored by Cisco, determining whether this is a patch-now or monitor situation1. Technical details of the vulnerability and patch are crucial for practitioners to understand the scope of the issue and take necessary measures to protect their systems. The patching of this zero-day exploit is critical for organizations to prevent potential attacks, so practitioners should prioritize applying the patch to prevent attackers from leveraging this vulnerability to gain unauthorized access to their systems.