# CVE-2025-27921: Cross-site scripting in n/a

> Attackers can inject malicious scripts into the Output Messenger web interface via unsanitized input, potentially compromising user sessions.

- **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:** 5 May 2025
- **Updated:** 5 May 2025
- **Also known as:** GHSA-h8x6-pcq3-5wvw

## What is CVE-2025-27921?

CVE-2025-27921 is a medium-severity cross-site scripting vulnerability in n/a, published on 5 May 2025. 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 reflected cross-site scripting (XSS) vulnerability was discovered in Output Messenger before 2.0.63, where unsanitized input could be injected into the web application’s response. This vulnerability occurs when user-controlled input is reflected back into the browser without proper sanitization or encoding.

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

## Which versions are affected by CVE-2025-27921?

It affects 1 product.


Products: Srimax Output Messenger.

## How do I fix CVE-2025-27921?

No fix has been published for CVE-2025-27921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-27921 being exploited?

There is no known exploitation of CVE-2025-27921 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-27920](https://insights.sbomify.com/CVE-2025-27920/): Srimax Output Messenger Directory Traversal (high 7.2, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27921 and fix it if it is affected.

What it is: CVE-2025-27921 is a medium-severity cross-site scripting vulnerability in n/a, published on 5 May 2025. 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-2025-27921 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-2025-27921/ (Markdown: https://insights.sbomify.com/CVE-2025-27921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27921
- OSV: https://osv.dev/vulnerability/CVE-2025-27921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27921/
Summaries are generated and may contain mistakes; the official description above is the record.