CVE-2026-20029 Cisco Identity Services Engine XML External Entity Processing Information Disclosure Vulnerability
An authenticated administrator can exploit an XML parsing flaw in Cisco ISE to read arbitrary files from the underlying operating system.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20029?
CVE-2026-20029 is a medium-severity vulnerability in Cisco Identity Services Engine Software, published on 7 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability in the licensing features of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an authenticated, remote attacker with administrative privileges to gain access to sensitive information. This vulnerability is due to improper parsing of XML that is processed by the web-based management interface of Cisco ISE and Cisco ISE-PIC. An attacker could exploit this vulnerability by uploading a malicious file to the application. A successful exploit could allow the attacker to read arbitrary files from the underlying operating system that could include sensitive data that should otherwise be inaccessible even to administrators. To exploit this vulnerability, the attacker must have valid administrative credentials.
Weakness: CWE-611
Which versions are affected by CVE-2026-20029?
How do I fix CVE-2026-20029?
No fix has been published for CVE-2026-20029 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20029 being exploited?
There is no known exploitation of CVE-2026-20029 in the wild and no public exploit code.
Sources
Also known as GHSA-f26c-v5jj-mj89.