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Advisory severityMedium6.1Cisco

Medium [CVE-2026-20309] Cisco Identity Services Engine Cross-Site Scripting Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20309 affecting Identity Services Engine Software.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

cisco-sa-ise-xss-Uz9VWRQ Source published Source updated

VulniPulse record published Record updated

CVE-2026-20309
Affected products & platforms
CiscoISEIdentity Services Engine
Open source advisory

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Summary

A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting (XSS) attack against a user of the interface.

This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link.

A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

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

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories.

In addition, for further documentation of improvements and fixes in Cisco Identity Services Engine, see Cisco Identity Services Engine Security Hardening Release: September 2026.

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

Affected versions
  • Scope: At the time of publication, this vulnerability affected Cisco ISE, regardless of device configuration.
  • 3.2 and earlier — Migrate to a fixed release
  • Release 3.3 (first fixed: 3.3 Patch 12)
  • Release 3.4 (first fixed: 3.4 Patch 7)
  • Release 3.5 (first fixed: 3.5 Patch 4)

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • 3.3 Patch 12
  • 3.4 Patch 7
  • 3.5 Patch 4

Official advisory · high-confidence parse· fetched 13 days 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 3.2 and earlier: migrate to a fixed release.
  • Release 3.3: upgrade to 3.3 Patch 12.
  • Release 3.4: upgrade to 3.4 Patch 7.
  • Release 3.5: upgrade to 3.5 Patch 4.
Workaround status
  • There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

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