Cisco has identified a vulnerability in its Identity Services Engine (ISE) that could allow attackers to access sensitive information, even some that is restricted from admin access. This flaw necessitates credential rotation and a patch installation to secure the system.
Cisco ISE functions as a network access control platform that regulates access policies and manages devices connected to the network. Although this vulnerability is significant, it is noted that exploiting it requires the attacker to have administrative privileges already. Paddy Harrington, a senior analyst at Forrester Research, cautioned organizations not to overlook this issue.
Before proceeding with the patch, administrators are advised to take specific precautions:
- Rotate ISE credentials for users who already have access.
- Limit access to necessary users only.
- Restrict the number of devices capable of connecting to the ISE server.
- Apply the patch as soon as the server can be taken offline.
Cisco reported that the vulnerability, identified as CVE-2026-20029, stems from improper XML parsing in the web-based management interface of both ISE and Cisco ISE Passive Identity Connector (ISE-PIC). It is rated with medium severity, having a CVSS score of 4.9.
The vulnerability likely involves an XML External Entity issue. This vulnerability enables attackers to insert commands in the XML that could instruct the parser to access sensitive local files or external URLs. An attacker could use this method to read confidential files, possibly including user credentials, which should ideally remain inaccessible to ISE administrators.
According to the advisory, an attacker might upload a malicious file to the application that could facilitate unauthorized access to confidential data that should be off-limits even to those with administrative roles. Although there is proof-of-concept exploit code available, Cisco has not yet detected any malicious exploitation of this vulnerability.
The risk of credential theft is especially prevalent today, with many IT systems still using default credentials. Harrington highlighted the issue of systems being left vulnerable, particularly those behind firewalls, where administrators may mistakenly believe they are secure from external threats.
This incident coincides with a recent report from SCORadar, which disclosed a record of credential theft in 2025, noting that approximately 388 million credentials were stolen across major platforms including Facebook, Google, and Roblox.
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