# CVE-2015-7816: Deserialization in n/a

> Remote attackers can execute arbitrary PHP code and perform SSRF via crafted HTTP headers in Piwik's Referrers plugin.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Nov 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-m78v-8rvj-3rm2

## What is CVE-2015-7816?

CVE-2015-7816 is a high-severity unsafe deserialization vulnerability in n/a, published on 16 Nov 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The DisplayTopKeywords function in plugins/Referrers/Controller.php in Piwik before 2.15.0 allows remote attackers to conduct PHP object injection attacks, conduct Server-Side Request Forgery (SSRF) attacks, and execute arbitrary PHP code via a crafted HTTP header.

## Which versions are affected by CVE-2015-7816?

It affects 1 product.


Products: Matomo Matomo.

## How do I fix CVE-2015-7816?

No fix has been published for CVE-2015-7816 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-7816 being exploited?

There is no known exploitation of CVE-2015-7816 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2015-7815](https://insights.sbomify.com/CVE-2015-7815/): Path traversal in n/a (high 7.5)
- [CVE-2009-4137](https://insights.sbomify.com/CVE-2009-4137/): Deserialization in n/a (high 7.5)
- [CVE-2009-4140](https://insights.sbomify.com/CVE-2009-4140/): File upload in n/a (high 7.5)
- [CVE-2011-4941](https://insights.sbomify.com/CVE-2011-4941/): Piwik (now Matomo) Vulnerable to Arbitrary Code Execution (medium 6.8)
- [CVE-2010-2786](https://insights.sbomify.com/CVE-2010-2786/): Path traversal in n/a (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-7816 and fix it if it is affected.

What it is: CVE-2015-7816 is a high-severity unsafe deserialization vulnerability in n/a, published on 16 Nov 2015. 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-2015-7816 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-2015-7816/ (Markdown: https://insights.sbomify.com/CVE-2015-7816/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7816
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7816
- OSV: https://osv.dev/vulnerability/CVE-2015-7816

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7816/
Summaries are generated and may contain mistakes; the official description above is the record.