Cisco ISE: auth bypass vuln

Cisco Identity Services Engine Software

Multiple vulnerabilities in Cisco Identity Services Engine allow an authenticated attacker to modify parts of the configuration.

Do this now

Apply the vendor’s fixed release from the advisory.

Who should check: teams running VPN & firewalls

Still cooking for Cisco Identity Services Engine Software and Cisco ISE Passive Identity Connector.

First seen: 10 Nov 2026
Last update: 10 Nov 2026, 23:18 UTC
Identifiers: CVE-2026-20183
CVE-2026-20285
CVE-2026-20286
CVSS: 4.3
Source: news
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Cisco ISE: auth bypass vuln
Severity: medium. Patch status: patched.
Affected: Cisco Identity Services Engine Software
Ids: CVE-2026-20183, CVE-2026-20285, CVE-2026-20286

Multiple vulnerabilities in Cisco Identity Services Engine allow an authenticated attacker to modify parts of the configuration.

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. Fix by release line: Cisco Identity Services Engine Software: 3.2.x → migrate to a fixed release; 3.1.x → migrate to a fixed release. Cisco ISE Passive Identity Connector: 3.2.x → migrate to a fixed release; 3.1.x → migrate to a fixed release.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Cisco Identity Services Engine Software 3.2.x, 3.1.x | migrate | migrate to a fixed release | Cisco has released software updates that address these vulnerabilities |
| Cisco ISE Passive Identity Connector 3.2.x, 3.1.x | migrate | migrate to a fixed release | Cisco has released software updates that address these vulnerabilities |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-20183") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-auth-bypass-1-MxcTNgwx?vs_f=Cisco%20Security%20Advisory%26vs_cat=Security%20Intelligence%26vs_type=RSS%26vs_p=Cisco%20Identity%20Services%20Engine%20Authorization%20Bypass%20Vulnerabilities%26vs_k=1
https://pwned.coffee/i/cisco-ise-auth-bypass-vuln

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Cisco Identity Services Engine Software 3.2 to now migrate to a fixed release Vendor advisory checked 10 Nov
Cisco Identity Services Engine Software 3.1 to now migrate to a fixed release Vendor advisory checked 10 Nov
Cisco ISE Passive Identity Connector 3.2 to now migrate to a fixed release Vendor advisory checked 10 Nov
Cisco ISE Passive Identity Connector 3.1 to now migrate to a fixed release Vendor advisory checked 10 Nov
Score: CVSS 4.3 (medium). CVSS 3.1 4.3 (CNA cisco) for CVE-2026-20183
Last checked: 13 Nov 2026, 16:26 UTC

Product	Affected	Fixed in	Source
Cisco Identity Services Engine Software	3.2 to now	migrate to a fixed release	Vendor advisory checked 10 Nov
Cisco Identity Services Engine Software	3.1 to now	migrate to a fixed release	Vendor advisory checked 10 Nov
Cisco ISE Passive Identity Connector	3.2 to now	migrate to a fixed release	Vendor advisory checked 10 Nov
Cisco ISE Passive Identity Connector	3.1 to now	migrate to a fixed release	Vendor advisory checked 10 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

sec.cloudapps.cisco.com: Cisco Identity Services Engine Authorization Bypass Vulnerabilities

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