# CVE-2025-53523: Cross-site scripting in GroupSession Free edition

> A logged-in user can inject malicious scripts via stored XSS, allowing arbitrary code execution in other users' browsers.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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:** 12 Dec 2025
- **Updated:** 12 Dec 2025
- **Also known as:** GHSA-95x3-5ffc-v69j

## What is CVE-2025-53523?

CVE-2025-53523 is a medium-severity cross-site scripting vulnerability in Japan Total System Co.,Ltd. GroupSession Free edition, published on 12 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. A logged-in user can prepare a malicious page or URL, and an arbitrary script may be executed on the web browser when another user accesses it.

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

## Which versions are affected by CVE-2025-53523?

It affects 1 product.


Products: Groupsession Groupsession.

## How do I fix CVE-2025-53523?

No fix has been published for CVE-2025-53523 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-53523 being exploited?

There is no known exploitation of CVE-2025-53523 in the wild and no public exploit code.

## Other vulnerabilities in Japan Total System Co.,Ltd. GroupSession Free edition

- [CVE-2021-20874](https://insights.sbomify.com/CVE-2021-20874/): Missing authorization in GroupSession Free edition, GroupSession byCloud, GroupSession ZION (high 7.5)
- [CVE-2025-61987](https://insights.sbomify.com/CVE-2025-61987/): Cross-site request forgery in GroupSession Free edition (medium 6.9)
- [CVE-2021-20876](https://insights.sbomify.com/CVE-2021-20876/): Path traversal in GroupSession Free edition, GroupSession byCloud, GroupSession ZION (medium 6.8)
- [CVE-2017-2165](https://insights.sbomify.com/CVE-2017-2165/): Information disclosure in GroupSession (medium 6.5)
- [CVE-2021-20875](https://insights.sbomify.com/CVE-2021-20875/): Open redirect in GroupSession Free edition, GroupSession byCloud, GroupSession ZION (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-53523 and fix it if it is affected.

What it is: CVE-2025-53523 is a medium-severity cross-site scripting vulnerability in Japan Total System Co.,Ltd. GroupSession Free edition, published on 12 Dec 2025. 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-2025-53523 in the wild and no public exploit code.

Affected product: Japan Total System Co.,Ltd. GroupSession Free edition. 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-2025-53523/ (Markdown: https://insights.sbomify.com/CVE-2025-53523/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-53523
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-53523
- OSV: https://osv.dev/vulnerability/CVE-2025-53523

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-53523/
Summaries are generated and may contain mistakes; the official description above is the record.