# CVE-2026-20190: Cisco ISE improper authorization information disclosure

Source: https://junglewise.ai/threats/cve-2026-20190-cisco-ise-improper-authorization-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-20190 · Severity: high · CVSS 7.5 · Published 2026-06-17

Cisco Identity Services Engine (ISE) is a security policy management platform used to control network access and verify user identities. A vulnerability in this system allows an unauthorized person to remotely access sensitive internal data without needing a password. This could result in the exposure of encrypted user credentials, which attackers can use to gain further access to the corporate network.

Technologies: [Cisco Identity Services Engine](https://junglewise.ai/threats/technologies/identity-services-engine), [Cisco ISE Passive Identity Connector](https://junglewise.ai/threats/technologies/ise-passive-identity-connector). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2026-20190 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20190 being exploited in the wild.

**How severe is CVE-2026-20190?** High severity, with a CVSS score of 7.5, published 17 June 2026.

**Which products and versions are affected?** Cisco Identity Services Engine 3.4.0 through 3.4 Patch 5, 3.5.0 through 3.5 Patch 2; Cisco ISE Passive Identity Connector 3.4.0.

**Is there a fix for CVE-2026-20190?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-20190 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-20190?** Check whether you run Cisco Identity Services Engine or Cisco ISE Passive Identity Connector at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An information disclosure vulnerability exists in Cisco ISE and ISE-PIC due to improper authorization checks when specific resources are accessed. An unauthenticated, remote attacker can exploit this by sending crafted network traffic to the affected device. Successful exploitation allows the attacker to retrieve sensitive information, specifically including hashed credentials. The vulnerability is tracked under Cisco Bug ID CSCwt22936. Cisco has released software updates (3.4 Patch 6 and 3.5 Patch 3) to address the issue; no workarounds are available.

## Affected products

- Cisco Identity Services Engine Software 3.4.0 through 3.4 Patch 5, 3.5.0 through 3.5 Patch 2
- Cisco ISE Passive Identity Connector 3.4.0

## Timeline

- 2026-06-17: advisory: Initial public release by Cisco
- 2026-06-17: disclosed
- 2026-06-19: other: Advisory updated to clarify hot patch availability

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-G5WP8vv](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-G5WP8vv)

## Related threats

- [Cisco Identity Services Engine authorization bypass in management interface](https://junglewise.ai/threats/cve-2026-20183-a-vulnerability-in-the-web-based-management-interface-of-cisco)
- [Cisco Identity Services Engine authorization bypass in certificate enrollment](https://junglewise.ai/threats/cve-2026-20241-a-vulnerability-in-the-authorization-mechanism-of-cisco-identity)
- [A vulnerability in an API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass authentication.](https://junglewise.ai/threats/cve-2026-76460-cisco-identity-services-engine-incorrect-privileged-api-use)
- [Cisco ISE SQL and HQL injection in APIs](https://junglewise.ai/threats/cve-2026-76451-cisco-ise-sql-and-hql-injection-in-apis)
- [Cisco Identity Services Engine SQL and HQL injection](https://junglewise.ai/threats/cve-2026-76450-cisco-identity-services-engine-sql-and-hql-injection)