# CVE-2025-61950: Missing authorization in GroupSession Free edition

> A logged-in user can modify non-editable memo fields in circular notices due to improper authorization checks in GroupSession.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Dec 2025
- **Updated:** 12 Dec 2025
- **Also known as:** GHSA-gq66-gr4q-gqwp

## What is CVE-2025-61950?

CVE-2025-61950 is a medium-severity missing authorization 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, with no action from the victim.

### Official description

In GroupSession, a Circular notice can be created with its memo field non-editable, but the authorization check is improperly implemented. With some crafted request, a logged-in user may alter the memo field. The affected products and versions are GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2025-61950?

It affects 1 product.


Products: Groupsession Groupsession.

## How do I fix CVE-2025-61950?

No fix has been published for CVE-2025-61950 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-61950 being exploited?

There is no known exploitation of CVE-2025-61950 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-2025-61950 and fix it if it is affected.

What it is: CVE-2025-61950 is a medium-severity missing authorization 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, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-61950 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-2025-61950/ (Markdown: https://insights.sbomify.com/CVE-2025-61950/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-61950
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-61950
- OSV: https://osv.dev/vulnerability/CVE-2025-61950

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-61950/
Summaries are generated and may contain mistakes; the official description above is the record.