# CVE-2016-4876: Cross-site request forgery in baserCMS

> Attackers can hijack administrator sessions to execute arbitrary PHP code via CSRF, requiring an upgrade to secure the CMS.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 12 May 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-r75x-rc5q-788v

## What is CVE-2016-4876?

CVE-2016-4876 is a high-severity vulnerability in Basercms Basercms, published on 12 May 2017. 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

Cross-site request forgery (CSRF) vulnerability in baserCMS version 3.0.10 and earlier allows remote attackers to hijack the authentication of administrators to execute arbitrary PHP code via unspecified vectors.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2016-4876?

It affects 1 product.


Products: Basercms Basercms.

## How do I fix CVE-2016-4876?

No fix has been published for CVE-2016-4876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-4876 being exploited?

There is no known exploitation of CVE-2016-4876 in the wild and no public exploit code.

## Other vulnerabilities in Basercms Basercms

- [CVE-2023-25654](https://insights.sbomify.com/CVE-2023-25654/): baserCMS File Uploader Remote Code Execution (RCE) vulnerability (critical 9.8)
- [CVE-2023-25655](https://insights.sbomify.com/CVE-2023-25655/): baserCMS allows any file to be uploaded (critical 9.8)
- [CVE-2017-10842](https://insights.sbomify.com/CVE-2017-10842/): baserCMS SQL Injection vulnerability (critical 9.8)
- [CVE-2026-30880](https://insights.sbomify.com/CVE-2026-30880/): baserCMS: OS command injection vulnerability in installer (critical 9.2)
- [CVE-2026-21861](https://insights.sbomify.com/CVE-2026-21861/): baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-4876 and fix it if it is affected.

What it is: CVE-2016-4876 is a high-severity vulnerability in Basercms Basercms, published on 12 May 2017. 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-2016-4876 in the wild and no public exploit code.

Affected product: Basercms Basercms. 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-2016-4876/ (Markdown: https://insights.sbomify.com/CVE-2016-4876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-4876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-4876
- OSV: https://osv.dev/vulnerability/CVE-2016-4876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-4876/
Summaries are generated and may contain mistakes; the official description above is the record.