# CVE-2026-4794: Multiple cross-site scripting (XSS) vulnerabilities in PaperCut NG/MF

> Authenticated administrators can inject scripts via UI fields to compromise other admin sessions or perform unauthorized actions.

- **Severity:** Low 2.1 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-m6wx-rxrp-cc9p

## What is CVE-2026-4794?

CVE-2026-4794 is a low-severity cross-site scripting vulnerability in PaperCut NG/MF, published on 31 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

Multiple cross-site scripting (XSS) vulnerabilities in PaperCut NG/MF before 25.0.10 allow authenticated administrator users to inject arbitrary web script or HTML code via different UI fields. This could be used to compromise other admininistrator's sessions or perform unauthorized actions via the administrator's authenticated context (e.g. requires an active login session).

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

## Which versions are affected by CVE-2026-4794?

It affects 2 products.


Products: Papercut Papercut Mf, Papercut Papercut Ng.

## How do I fix CVE-2026-4794?

No fix has been published for CVE-2026-4794 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4794 being exploited?

There is no known exploitation of CVE-2026-4794 in the wild and no public exploit code.

## Other vulnerabilities in PaperCut NG/MF

- [CVE-2023-27350](https://insights.sbomify.com/CVE-2023-27350/): PaperCut MF/NG Improper Access Control (critical 9.8, exploited in the wild)
- [CVE-2026-82078](https://insights.sbomify.com/CVE-2026-82078/): PaperCut NG/MF Unsafe Reflection (critical 9.4, exploited in the wild)
- [CVE-2026-81578](https://insights.sbomify.com/CVE-2026-81578/): PaperCut NG/MF Missing Authentication for Critical Function (high 8.8, exploited in the wild)
- [CVE-2023-2533](https://insights.sbomify.com/CVE-2023-2533/): PaperCut NG/MF Cross-Site Request Forgery (CSRF) (high 8.4, exploited in the wild)
- [CVE-2023-27351](https://insights.sbomify.com/CVE-2023-27351/): PaperCut NG/MF Improper Authentication (high 8.2, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4794 and fix it if it is affected.

What it is: CVE-2026-4794 is a low-severity cross-site scripting vulnerability in PaperCut NG/MF, published on 31 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-2026-4794 in the wild and no public exploit code.

Affected product: PaperCut NG/MF. 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-2026-4794/ (Markdown: https://insights.sbomify.com/CVE-2026-4794/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4794
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4794
- OSV: https://osv.dev/vulnerability/CVE-2026-4794

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4794/
Summaries are generated and may contain mistakes; the official description above is the record.