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Vulnerabilities

Vulnerability · CVE-2026-20148

ZDI-26-582: Cisco Identity Services Engine PatchUpdateListener Directory Traversal Information Disclosure Vulnerability

Published Apr 15, 2026 · catalog updated Sep 25, 2026 · identity services engine

Check if you run it

No confirmed exploitation is on record for CVE-2026-20148. EPSS is 6.54%. Act only if a listed version of identity services engine is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
6.54%
Remediation
Advisory link
Affected products
cpe cisco/identity services engine · cpe cisco/identity services engine passive identity connector

A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to perform path traversal attacks on the underlying operating system and read arbitrary files. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected system. A successful exploit could allow the attacker to access sensitive files on the affected system.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/identity services engine3.1.0
  • cpe cisco/identity services engine passive identity connectorversion unspecified

How to fix CVE-2026-20148

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20148. EPSS is 6.54%. Act only if a listed version of identity services engine is installed.

Which versions are affected?

Compare what you have installed with cisco/identity services engine 3.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 6.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 13, 2026 · Catalog

    Detected

    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-2026-20148.

  2. Sep 25, 2026 · NIST NVD

    Updated

    A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to perform path traversal attacks on the underlying operating system and read arbitrary files. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sen

Sources

  • CVE.orgVulnerability recordCVE-2026-20148

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20148

    30-day exploitation probability 6.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20148

    A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to perform path traversal attacks on the underlying operating system and read arbitrary files. To exploit this vulnerability, the attacker must have valid administrative credentials. T

    nvd.nist.gov
  • Zero Day InitiativeCoordinated disclosureZDI-26-582

    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-2026-20148.

    zerodayinitiative.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.