# CVE-2026-20170: Cross-site scripting in Cisco Webex Contact Center

> Unauthenticated remote attackers can execute cross-site scripting attacks to steal sensitive browser information via malicious links.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Apr 2026
- **Updated:** 15 Apr 2026
- **Also known as:** GHSA-fjg2-h4xx-5w8c

## What is CVE-2026-20170?

CVE-2026-20170 is a medium-severity cross-site scripting vulnerability in Cisco Webex Contact Center, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the Desktop Agent functionality of Cisco Webex Contact Center could have allowed an unauthenticated, remote attacker to conduct cross-site scripting attacks. Cisco has addressed this vulnerability in the Cisco Webex Contact Center service, and no customer action is needed.

 This vulnerability existed because HTML and script content was not properly handled. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to steal sensitive information from the browser, including authentication and session information.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2026-20170?

It affects 1 product.


Products: Cisco Webex Contact Center.

## How do I fix CVE-2026-20170?

No fix has been published for CVE-2026-20170 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20170 being exploited?

There is no known exploitation of CVE-2026-20170 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20170 and fix it if it is affected.

What it is: CVE-2026-20170 is a medium-severity cross-site scripting vulnerability in Cisco Webex Contact Center, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-20170 in the wild and no public exploit code.

Affected product: Cisco Webex Contact Center. 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-2026-20170/ (Markdown: https://insights.sbomify.com/CVE-2026-20170/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20170
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20170
- OSV: https://osv.dev/vulnerability/CVE-2026-20170

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-20170/
Summaries are generated and may contain mistakes; the official description above is the record.