An improper authorization vulnerability (CVE-2026-20155) in the Cisco EPNM web management interface allows an authenticated low-privileged attacker to access sensitive session information by querying a specific REST API endpoint. Cisco has released software updates to address this high-impact vulnerability, but no workarounds are available. The full advisory is available at the provided Cisco Security Advisory link.
A vulnerability in the web-based management interface of Cisco Evolved Programmable Network Manager (EPNM) could allow an authenticated, remote attacker with low privileges to access sensitive information that they are not authorized to access. This vulnerability is due to improper authorization checks on a REST API endpoint of an affected device. An attacker could exploit this vulnerability by querying the affected endpoint. A successful exploit could allow the attacker to view session information of active Cisco EPNM users, including users with administrative privileges, which could result in the affected device being compromised. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-epnm-improp-auth-mUwFWUU3 <br/>Security Impact Rating: High <br/>CVE: CVE-2026-20155