# CVE-2023-3526: PHOENIX CONTACT: Cross-site Scripting vulnerability in TC ROUTER, TC CLOUD CLIENT and CLOUD CLIENT devices

> Unauthenticated remote attackers can execute arbitrary code in the user's browser via reflective XSS in the license viewer page of PHOENIX CONTACT devices.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 8 Aug 2023
- **Updated:** 27 Feb 2025
- **Also known as:** GHSA-v33q-q39m-425m

## What is CVE-2023-3526?

CVE-2023-3526 is a critical cross-site scripting vulnerability in PHOENIX CONTACT CLOUD CLIENT 1101T-TX/TX, published on 8 Aug 2023. 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

In PHOENIX CONTACTs TC ROUTER and TC CLOUD CLIENT in versions prior to 2.07.2 as well as CLOUD CLIENT 1101T-TX/TX prior to 2.06.10 an unauthenticated remote attacker could use a reflective XSS within the license viewer page of the devices in order to execute code in the context of the user's browser.

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

## Which versions are affected by CVE-2023-3526?

It affects 7 products.


Products: Phoenixcontact Cloud Client 1101t-Tx Firmware, Phoenixcontact Tc Cloud Client 1002-4g Att Firmware, Phoenixcontact Tc Cloud Client 1002-4g Firmware, Phoenixcontact Tc Cloud Client 1002-4g Vzw Firmware, Phoenixcontact Tc Router 3002t-4g Att Firmware, Phoenixcontact Tc Router 3002t-4g Firmware, Phoenixcontact Tc Router 3002t-4g Vzw Firmware.

## How do I fix CVE-2023-3526?

No fix has been published for CVE-2023-3526 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3526 being exploited?

There is no known exploitation of CVE-2023-3526 in the wild and no public exploit code.

## Other vulnerabilities in PHOENIX CONTACT CLOUD CLIENT 1101T-TX/TX

- [CVE-2023-3569](https://insights.sbomify.com/CVE-2023-3569/): PHOENIX CONTACT: Denial-of-Service due to malicious XML files in TC ROUTER, TC CLOUD CLIENT and CLOUD CLIENT (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3526 and fix it if it is affected.

What it is: CVE-2023-3526 is a critical cross-site scripting vulnerability in PHOENIX CONTACT CLOUD CLIENT 1101T-TX/TX, published on 8 Aug 2023. 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-2023-3526 in the wild and no public exploit code.

Affected product: PHOENIX CONTACT CLOUD CLIENT 1101T-TX/TX. 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-2023-3526/ (Markdown: https://insights.sbomify.com/CVE-2023-3526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3526
- OSV: https://osv.dev/vulnerability/CVE-2023-3526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3526/
Summaries are generated and may contain mistakes; the official description above is the record.