A vulnerability in Cisco’s Catalyst SD-WAN Manager has been identified and is currently being exploited by attackers to gain root access. This issue, tracked as CVE-2026-20262, affects the web user interface of the software due to improper validation of user input during file uploads.
According to Cisco’s security advisory, an attacker can exploit this vulnerability by sending a specially crafted HTTP request to an affected API endpoint. If successful, this could enable the attacker to create or overwrite files on the underlying operating system, potentially allowing for elevation to root privileges.
Details of the Vulnerability
To exploit this vulnerability, an attacker must possess valid credentials for at least a lower-privileged single-task user account. This requirement contributes to the medium severity rating of 6.8 on the CVSS scale. However, the availability of valid credentials can make exploitation easier, as evidenced by reports of active attacks.
Current Exploitation Status
As of June 2026, Cisco’s Product Security Incident Response Team (PSIRT) has confirmed limited exploitation of this vulnerability. The company has strongly advised customers to upgrade to a fixed software release to address the issue. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has also added CVE-2026-20262 to its Known Exploited Vulnerabilities catalog, indicating evidence of active exploitation and urging federal agencies to apply the patch within two weeks.
Impact and Mitigation
This vulnerability affects all deployment types of the Catalyst SD-WAN Manager, regardless of device configuration. There are currently no workarounds available, making it essential for users to upgrade to the patched version to mitigate the risks associated with this flaw. This incident follows closely on the heels of another vulnerability in the same product, CVE-2026-20245, which was also under active exploitation.
As this is the eighth Cisco SD-WAN vulnerability listed in CISA’s catalog this year, organizations utilizing Cisco’s SD-WAN solutions should prioritize applying the necessary updates to safeguard their systems.
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
