ZDI-CAN-27889: ZDI-26-019: Cisco Identity Services Engine getSpecificPLRfromAuthCode XML External Entity Processing Information Disclosure Vulnerability

Published Jan 9, 2026
·
Updated

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Cisco Identity Services Engine. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 4.9. The following CVEs are assigned: CVE-2026-20029.

Affected Software

1 affected component
Cisco Identity Services Engine

Event History

Jan 9, 2026
Advisory Published
via ZDI·06:00 AM
Data Sourced
via ZDI·06:00 AM
Description
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Frequently Asked Questions

1

What is the severity of ZDI-CAN-27889?

The severity of ZDI-CAN-27889 is classified as high due to the potential for sensitive information disclosure.

2

How do I fix ZDI-CAN-27889?

To fix ZDI-CAN-27889, update your Cisco Identity Services Engine to the latest version that addresses this vulnerability.

3

What systems are affected by ZDI-CAN-27889?

ZDI-CAN-27889 specifically affects installations of Cisco Identity Services Engine.

4

What type of vulnerability is ZDI-CAN-27889?

ZDI-CAN-27889 is an XML External Entity Processing (XXE) vulnerability that allows information disclosure.

5

Is authentication required to exploit ZDI-CAN-27889?

Yes, authentication is required to exploit ZDI-CAN-27889.

Company

Resources

Contact

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ZDI-CAN-27889 - ZDI-26-019: Cisco Identity Services Engine getSpecificPLRfromAuthCode XML External Entity Processing Information Disclosure Vulnerability - SecAlerts