CVE-2026-20155
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 Security Impact Rating: High CVE: CVE-2026-20155
CSIRTS triage
- What
- A vulnerability allows an authenticated attacker to access sensitive information they are not authorized to access.
- Who is affected
- Authenticated users of Cisco Evolved Programmable Network Manager with low privileges.
- Urgency
- Remediation is urgent due to the high severity and potential for information compromise.
- Action
- Update to the latest software version provided by Cisco to mitigate this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Advisory coverage (1)
- highCisco Evolved Programmable Network Manager Improper Authorization Vulnerabilitycisco-psirt · 2026-04-01
External references
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