Cisco Identity Services Engine PatchUpdateListener Directory Traversal Information Disclosure Vulnerability

August 13th, 2026
ZDI-26-582 ZDI-CAN-28708

CVE ID

CVE-2026-20148

CVSS Score

4.9 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected Vendors

Cisco

Affected Products

Identity Services Engine

Vulnerability Details

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 specific flaw exists within the PatchUpdateListener method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose information in the context of the iseadminportal user.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-rce-traversal-8bYndVrZ

Disclosure Timeline

  • 2025-12-18 - Vulnerability reported to vendor
  • 2026-08-13 - Coordinated public release of advisory
  • 2026-08-13 - Advisory Updated

Credit

Jonathan Lein of Trend Research

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