Medium6.0Cisco

Medium [CVE-2026-20136] Cisco Identity Services Engine Authenticated Privilege Escalation Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20136 affecting ISE, Identity Services Engine Software.

cisco-sa-ise-cmd-inj-5WSJcYJB Published Apr 15, 2026Updated by vendor Apr 15, 2026

CVE-2026-20136

Affected products & platforms

CiscoISEIdentity Services Engine

Open vendor advisory

Android app · Google Play

Monitor future Cisco CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

A vulnerability in the CLI of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an authenticated, local attacker with administrative privileges to perform a command injection attack on the underlying operating system and elevate privileges to root.

This vulnerability is due to insufficient validation of user supplied input. An attacker could exploit this vulnerability by providing crafted input to a specific CLI command.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected products named by the advisory: Identity Services Engine Software.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco ISE and ISE-PIC, regardless of device configuration.
Release 3.3 and earlier (first fixed: 3.3 Patch 11 (Apr 2026))
Release 3.4 (first fixed: 3.4 Patch 6 (Apr 2026))
Release 3.51 (first fixed: 3.5 Patch 3)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

3.3 Patch 11 (Apr 2026)
3.4 Patch 6 (Apr 2026)
3.5 Patch 3

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Release 3.3 and earlier: upgrade to 3.3 Patch 11 (Apr 2026).
Release 3.4: upgrade to 3.4 Patch 6 (Apr 2026).
Release 3.51: upgrade to 3.5 Patch 3.

Workaround status

There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20136NVD CVE.org MITRE

Official resources

Cisco ISE upgrade guide (target: 3.3 / 3.4 / 3.5)
Official documentation
This advisory names 3.3 / 3.4 / 3.5 as the first fixed releases — official upgrade documentation for Cisco Identity Services Engine (ISE).
Cisco ISE release notes
Release notes
Release notes and resolved-caveats list for the fixed ISE version.

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.