# CVE-2026-20241: Cisco Identity Services Engine Authorization Bypass Vulnerability

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

A vulnerability in the authorization mechanism of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an unauthenticated, remote attacker to obtain an endpoint identity certificate.

This vulnerability is due to improper authorization checks. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to bypass authorization to obtain an endpoint certificate.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Cisco / Cisco Identity Services Engine Software: 3.1.0 (affected); 3.1.0 p1 (affected); 3.1.0 p3 (affected); 3.1.0 p2 (affected); 3.2.0 (affected); 3.1.0 p4 (affected); 3.1.0 p5 (affected); 3.2.0 p1 (affected); 3.1.0 p6 (affected); 3.2.0 p2 (affected); 3.1.0 p7 (affected); 3.3.0 (affected); 3.2.0 p3 (affected); 3.2.0 p4 (affected); 3.1.0 p8 (affected); 3.2.0 p5 (affected); 3.2.0 p6 (affected); 3.1.0 p9 (affected); 3.3 Patch 2 (affected); 3.3 Patch 1 (affected); 3.3 Patch 3 (affected); 3.4.0 (affected); 3.2.0 p7 (affected); 3.3 Patch 4 (affected); 3.4 Patch 1 (affected); 3.1.0 p10 (affected); 3.3 Patch 5 (affected); 3.3 Patch 6 (affected); 3.4 Patch 2 (affected); 3.3 Patch 7 (affected); 3.4 Patch 3 (affected); 3.5.0 (affected); 3.4 Patch 4 (affected); 3.3 Patch 8 (affected); 3.2 Patch 8 (affected); 3.5 Patch 1 (affected); 3.3 Patch 9 (affected); 3.2 Patch 9 (affected); 3.4 Patch 5 (affected); 3.5 Patch 3 (affected); 3.5 Patch 2 (affected); 3.3 Patch 10 (affected); 3.3 Patch 11 (affected); 3.4 Patch 6 (affected); 3.2 Patch 10 (affected); 3.1.0 p11 (affected). Source: CNA: cisco
- Cisco / Cisco ISE Passive Identity Connector: 3.2.0 (affected); 3.1.0 (affected); 3.3.0 (affected); 3.4.0 (affected); 3.5.0 (affected). Source: CNA: cisco

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: cisco

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: psirt@cisco.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-285

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cert-mE9BD5GO (CNA: cisco)

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cert-mE9BD5GO (psirt@cisco.com)

## Provenance

- CNA: cisco: https://www.cve.org/CVERecord?id=CVE-2026-20241; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20241; retrieved 2026-11-04; source updated 2026-11-04

Revision: 17423db9fbf2522554ad991a74ac286bb31652c4800a83c0973c5956cd95e96f

Canonical: https://y2.dev/cve/CVE-2026-20241

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.