# CVE-2026-20059: Cisco Unity Connection Reflected Cross-Site Scripting Vulnerability

> An unauthenticated attacker can execute arbitrary script code or access sensitive browser-based information by tricking a user into clicking a crafted link in the Cisco Unity Connection web interface.

- **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-83qv-c52p-jx5j

## What is CVE-2026-20059?

CVE-2026-20059 is a medium-severity cross-site scripting vulnerability in Cisco Unity Connection, 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 web-based management interface of Cisco Unity Connection could allow an unauthenticated, remote attacker to conduct a reflected XSS attack against a user of the interface.

This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user 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-2026-20059?

It affects 1 product.


Products: Cisco Unity Connection.

## How do I fix CVE-2026-20059?

No fix has been published for CVE-2026-20059 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20059 being exploited?

There is no known exploitation of CVE-2026-20059 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Unity Connection

- [CVE-2014-3333](https://insights.sbomify.com/CVE-2014-3333/): Privilege escalation in n/a (critical 9.0)
- [CVE-2012-0366](https://insights.sbomify.com/CVE-2012-0366/): Privilege escalation in n/a (critical 9.0)
- [CVE-2026-20034](https://insights.sbomify.com/CVE-2026-20034/): Cisco Unity Connection Remote Code Execution Vulnerability (high 8.8)
- [CVE-2012-3060](https://insights.sbomify.com/CVE-2012-3060/): Denial of service in n/a (high 7.8)
- [CVE-2012-0367](https://insights.sbomify.com/CVE-2012-0367/): Denial of service in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20059 and fix it if it is affected.

What it is: CVE-2026-20059 is a medium-severity cross-site scripting vulnerability in Cisco Unity Connection, 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-2026-20059 in the wild and no public exploit code.

Affected product: Cisco Unity Connection. 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-2026-20059/ (Markdown: https://insights.sbomify.com/CVE-2026-20059/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20059
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20059
- OSV: https://osv.dev/vulnerability/CVE-2026-20059

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20059/
Summaries are generated and may contain mistakes; the official description above is the record.