# CVE-2025-67834: Cross-site scripting in n/a

> An unauthenticated attacker can execute arbitrary scripts via the filter parameter in PRTG Network Monitor, potentially compromising user sessions.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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:** 14 Jan 2026
- **Updated:** 14 Jan 2026
- **Also known as:** GHSA-9w7m-hq4v-pffr

## What is CVE-2025-67834?

CVE-2025-67834 is a medium-severity cross-site scripting vulnerability in n/a, published on 14 Jan 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

Paessler PRTG Network Monitor before 25.4.114 allows XSS by an unauthenticated attacker via the filter parameter.

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

## Which versions are affected by CVE-2025-67834?

It affects 1 product.


Products: Paessler Prtg Network Monitor.

## How do I fix CVE-2025-67834?

No fix has been published for CVE-2025-67834 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-67834 being exploited?

There is no known exploitation of CVE-2025-67834 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-19410](https://insights.sbomify.com/CVE-2018-19410/): Paessler PRTG Network Monitor Local File Inclusion (critical 9.8, exploited in the wild)
- [CVE-2018-9276](https://insights.sbomify.com/CVE-2018-9276/): Paessler PRTG Network Monitor OS Command Injection (high 7.2, exploited in the wild)
- [CVE-2020-10374](https://insights.sbomify.com/CVE-2020-10374/): Command injection in n/a (critical 9.8)
- [CVE-2023-51630](https://insights.sbomify.com/CVE-2023-51630/): Paessler PRTG Network Monitor Cross-Site Scripting Authentication Bypass Vulnerability (high 8.8)
- [CVE-2023-31452](https://insights.sbomify.com/CVE-2023-31452/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-67834 and fix it if it is affected.

What it is: CVE-2025-67834 is a medium-severity cross-site scripting vulnerability in n/a, published on 14 Jan 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-2025-67834 in the wild and no public exploit code.

Affected product: n/a. 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-2025-67834/ (Markdown: https://insights.sbomify.com/CVE-2025-67834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-67834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-67834
- OSV: https://osv.dev/vulnerability/CVE-2025-67834

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-67834/
Summaries are generated and may contain mistakes; the official description above is the record.