Actively exploited in the wild
Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
Cisco - Catalyst SD-WAN Manager · Listed in the CISA KEV since 2026-09-30. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2026-76504
CriticalCVSS 9.8KEVSummary
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access the system with admin privileges. The issue is due to improper handling of URI encoding in HTTP requests, allowing bypass of an authentication rule for a specific API endpoint. An attacker can send a crafted HTTP request to gain admin access.
Risk Assessment
The risk is full compromise of the SD-WAN Manager without authentication, potentially leading to loss of confidentiality and integrity across the SD-WAN network.
Recommendation
Apply available Cisco security updates for Catalyst SD-WAN Manager. Restrict API access to trusted networks and monitor logs for unusual HTTP requests.
Other vulnerabilities in Cisco Catalyst SD-WAN Manager
See all- CVE-2026-20262MediumActively exploited
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager allows an authenticated remote attacker to create or overwrite any file on the filesystem. This is due to improper input validation during file upload.
- CVE-2026-20122MediumActively exploited
A vulnerability in the API of Cisco Catalyst SD-WAN Manager due to improper file handling allows an authenticated remote attacker to overwrite arbitrary files on the local file system. Valid read-only credentials with API access are required.
- CVE-2026-20294Medium
A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager allows an authenticated remote attacker with low privileges to view sensitive information in clear text. The issue is due to insufficient access control for certain template types, potentially exposing authentication credentials.
- CVE-2026-20224High
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, allows an unauthenticated, remote attacker to read arbitrary files stored on the affected system. The flaw is due to improper handling of XML External Entity (XXE) entries when parsing an XML file.
- CVE-2026-20210Medium
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) allows an authenticated, remote attacker with read-only permissions to modify configurations and perform unauthorized actions. The issue is due to a failure to redact sensitive information within device configurations and templates.
- CVE-2026-20209Medium
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) allows an authenticated attacker with read-only permissions to elevate privileges to high. The issue is due to sensitive session information being recorded in audit logs.
- CVE-2026-20108Medium
A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager allows an authenticated, remote attacker to perform a cross-site scripting (XSS) attack against a user of the interface. This is due to insufficient input validation.
Original NVD description (English source)
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS