# CVE-2026-20193: Cisco Identity Services Engine Authentication Bypass Vulnerability

> Authenticated attackers with read-only admin privileges can bypass RBAC to access sensitive RADIUS Policy details via API endpoints.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 May 2026
- **Updated:** 6 May 2026
- **Also known as:** GHSA-qwrq-5c2q-3p3m

## What is CVE-2026-20193?

CVE-2026-20193 is a medium-severity missing authorization vulnerability in Cisco Identity Services Engine, published on 6 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the RADIUS Policy API endpoints of Cisco ISE could allow an authenticated, remote attacker with read-only Administrator privileges to gain unauthorized access to sensitive information on an affected device.

This vulnerability is due to improper role-based access control (RBAC) permissions on the RADIUS Policy API endpoints. An attacker could exploit this vulnerability by bypassing the web-based management interface and directly calling an affected endpoint. A successful exploit could allow the attacker to gain unauthorized read access to sensitive RADIUS Policy details that are restricted for their role.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-20193?

It affects 1 product.


Products: Cisco Identity Services Engine.

## How do I fix CVE-2026-20193?

No fix has been published for CVE-2026-20193 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20193 being exploited?

There is no known exploitation of CVE-2026-20193 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Identity Services Engine

- [CVE-2026-76460](https://insights.sbomify.com/CVE-2026-76460/): Cisco Identity Services Engine Incorrect Use of Privileged APIs (critical 10.0, exploited in the wild)
- [CVE-2025-20337](https://insights.sbomify.com/CVE-2025-20337/): Cisco Identity Services Engine Injection (critical 10.0, exploited in the wild)
- [CVE-2025-20281](https://insights.sbomify.com/CVE-2025-20281/): Cisco Identity Services Engine Injection (critical 10.0, exploited in the wild)
- [CVE-2026-20130](https://insights.sbomify.com/CVE-2026-20130/): Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities (critical 10.0)
- [CVE-2026-20192](https://insights.sbomify.com/CVE-2026-20192/): Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20193 and fix it if it is affected.

What it is: CVE-2026-20193 is a medium-severity missing authorization vulnerability in Cisco Identity Services Engine, published on 6 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-20193 in the wild and no public exploit code.

Affected product: Cisco Identity Services Engine. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-20193/ (Markdown: https://insights.sbomify.com/CVE-2026-20193/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20193
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20193
- OSV: https://osv.dev/vulnerability/CVE-2026-20193

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20193/
Summaries are generated and may contain mistakes; the official description above is the record.