# CVE-2026-20090: Cisco Integrated Management Controller Cross-Site Scripting Vulnerability

> Authenticated administrators can inject scripts into Cisco IMC, allowing attackers to execute code or steal data from other users.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Apr 2026
- **Updated:** 22 Apr 2026
- **Also known as:** GHSA-37g6-52v8-pjqr

## What is CVE-2026-20090?

CVE-2026-20090 is a medium-severity cross-site scripting vulnerability in Cisco Unified Computing System, published on 1 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface.

This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-20090?

It affects 3 products.


Products: Cisco Enterprise Nfv Infrastructure Software, Cisco Unified Computing System, Cisco Unified Computing System E-Series Software.

## How do I fix CVE-2026-20090?

No fix has been published for CVE-2026-20090 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20090 being exploited?

There is no known exploitation of CVE-2026-20090 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Unified Computing System

- [CVE-2022-20777](https://insights.sbomify.com/CVE-2022-20777/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2022-20779](https://insights.sbomify.com/CVE-2022-20779/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2022-20780](https://insights.sbomify.com/CVE-2022-20780/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2021-34746](https://insights.sbomify.com/CVE-2021-34746/): Cisco Enterprise NFV Infrastructure Software Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2020-3470](https://insights.sbomify.com/CVE-2020-3470/): Cisco Integrated Management Controller Multiple Remote Code Execution Vulnerabilities (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20090 and fix it if it is affected.

What it is: CVE-2026-20090 is a medium-severity cross-site scripting vulnerability in Cisco Unified Computing System, published on 1 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-20090 in the wild and no public exploit code.

Affected product: Cisco Unified Computing System. 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-2026-20090/ (Markdown: https://insights.sbomify.com/CVE-2026-20090/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20090
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20090
- OSV: https://osv.dev/vulnerability/CVE-2026-20090

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-20090/
Summaries are generated and may contain mistakes; the official description above is the record.