# CVE-2026-20286: Cisco Identity Services Engine Authorization Bypass Vulnerability

Status: published. Published: 2026-09-16. Updated: 2026-11-10.

A vulnerability in the web-based management interface of Cisco Identify Services Engine (ISE) could allow an authenticated, remote attacker to modify parts of the configuration on an affected device.

This vulnerability is due to the lack of server-side validation of Administrator permissions. An attacker could exploit this vulnerability by submitting a crafted HTTP request to an affected system. A successful exploit could allow the attacker to modify descriptions of files on a specific page. To exploit this vulnerability, an attacker would need valid Administrator credentials.

## 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); 3.1.0 p12 (affected); 3.2 Patch 11 (affected). Source: CNA: cisco

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N; source: CNA: cisco

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N; source: NVD: psirt@cisco.com

- CISA KEV: No listing in collected sources

- EPSS: 0.47% as of 2026-11-10; percentile 41.29%

- SSVC: exploitation none; automatable no; 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-auth-bypass-1-MxcTNgwx (CNA: cisco)

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-auth-bypass-1-MxcTNgwx (psirt@cisco.com)

## Provenance

- CNA: cisco: https://www.cve.org/CVERecord?id=CVE-2026-20286; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20286; retrieved 2026-11-11; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-20286; retrieved 2026-11-10; source updated Not reported

Revision: 7f14fb2261495336c9a7f742a39ce4c2e69c9e617c4fc944aa9aecb2225fccdf

Canonical: https://y2.dev/cve/CVE-2026-20286

## 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.