# CVE-2026-20108: Cross-site scripting in Cisco Catalyst SD-WAN Manager

> An authenticated attacker can execute arbitrary scripts or access sensitive data by tricking a user into clicking a crafted link in the Cisco Catalyst SD-WAN Manager interface.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-4wfv-hq2x-7m5r

## What is CVE-2026-20108?

CVE-2026-20108 is a medium-severity cross-site scripting vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface of an affected device.

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

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

## Which versions are affected by CVE-2026-20108?

It affects 1 product.


Products: Cisco Catalyst Sd-Wan Manager.

## How do I fix CVE-2026-20108?

No fix has been published for CVE-2026-20108 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20108 being exploited?

There is no known exploitation of CVE-2026-20108 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Catalyst Sd-Wan Manager

- [CVE-2026-20182](https://insights.sbomify.com/CVE-2026-20182/): Cisco Catalyst SD-WAN Controller Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-20127](https://insights.sbomify.com/CVE-2026-20127/): Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-76504](https://insights.sbomify.com/CVE-2026-76504/): Cisco Catalyst SD-WAN Manager Hex Encoding (critical 9.8, exploited in the wild)
- [CVE-2026-20245](https://insights.sbomify.com/CVE-2026-20245/): Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output (high 7.8, exploited in the wild)
- [CVE-2022-20775](https://insights.sbomify.com/CVE-2022-20775/): Cisco SD-WAN Path Traversal (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20108 and fix it if it is affected.

What it is: CVE-2026-20108 is a medium-severity cross-site scripting vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-20108 in the wild and no public exploit code.

Affected product: Cisco Catalyst Sd-Wan Manager. 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-2026-20108/ (Markdown: https://insights.sbomify.com/CVE-2026-20108/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20108
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20108
- OSV: https://osv.dev/vulnerability/CVE-2026-20108

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20108/
Summaries are generated and may contain mistakes; the official description above is the record.