# CVE-2025-61505: Deserialization in n/a

> Attackers can achieve remote code execution or denial of service in e107 CMS by sending malicious serialized data to the install script.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 10 Oct 2025
- **Updated:** 3 Feb 2026
- **Also known as:** GHSA-fh75-ffj9-cpm7

## What is CVE-2025-61505?

CVE-2025-61505 is a medium-severity unsafe deserialization vulnerability in E107 E107, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

e107 CMS thru 2.3.3 are vulnerable to insecure deserialization in the `install.php` script. The script processes user-controlled input in the `previous_steps` POST parameter using `unserialize(base64_decode())` without validation, allowing attackers to craft malicious serialized data. This could lead to remote code execution, arbitrary file operations, or denial of service, depending on available PHP object gadgets in the codebase.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-61505?

It affects 1 product.


Products: E107 E107.

## How do I fix CVE-2025-61505?

No fix has been published for CVE-2025-61505 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-61505 being exploited?

There is no known exploitation of CVE-2025-61505 in the wild and no public exploit code.

Public exploit code:

- Insecure Deserialization in e107 CMS install.php (github_poc): https://github.com/pescada-dev/CVE-2025-61505

## Other vulnerabilities in E107 E107

- [CVE-2021-27885](https://insights.sbomify.com/CVE-2021-27885/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2016-10753](https://insights.sbomify.com/CVE-2016-10753/): Deserialization in n/a (high 8.8)
- [CVE-2018-15901](https://insights.sbomify.com/CVE-2018-15901/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2022-50916](https://insights.sbomify.com/CVE-2022-50916/): e107 CMS v3.2.1 - Upload restriction bypass (Authenticated [Admin])+ Server file override (high 8.7)
- [CVE-2022-50907](https://insights.sbomify.com/CVE-2022-50907/): e107 CMS v3.2.1 - Admin Upload Restriction Bypass + RCE (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-61505 and fix it if it is affected.

What it is: CVE-2025-61505 is a medium-severity unsafe deserialization vulnerability in E107 E107, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-61505 in the wild and no public exploit code.

Affected product: E107 E107. 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-2025-61505/ (Markdown: https://insights.sbomify.com/CVE-2025-61505/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-61505
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-61505
- OSV: https://osv.dev/vulnerability/CVE-2025-61505

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-61505/
Summaries are generated and may contain mistakes; the official description above is the record.