# CVE-2018-15882: File upload in n/a

> Attackers can upload malicious phar files to Joomla due to inadequate input filtering, potentially leading to remote code execution.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 29 Aug 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-w6c5-p2h3-rcm3

## What is CVE-2018-15882?

CVE-2018-15882 is a critical vulnerability in Joomla Joomla\!, published on 29 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Joomla! before 3.8.12. Inadequate checks in the InputFilter class could allow specifically prepared phar files to pass the upload filter.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2018-15882?

It affects 1 product.


Products: Joomla Joomla\!.

## How do I fix CVE-2018-15882?

No fix has been published for CVE-2018-15882 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-15882 being exploited?

There is no known exploitation of CVE-2018-15882 in the wild and no public exploit code.

## Other vulnerabilities in Joomla Joomla\!

- [CVE-2016-10033](https://insights.sbomify.com/CVE-2016-10033/): PHPMailer Command Injection (critical 9.8, exploited in the wild)
- [CVE-2023-23752](https://insights.sbomify.com/CVE-2023-23752/): Joomla! Improper Access Control (medium 5.3, exploited in the wild)
- [CVE-2026-48902](https://insights.sbomify.com/CVE-2026-48902/): Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links (critical 9.8)
- [CVE-2025-25226](https://insights.sbomify.com/CVE-2025-25226/): [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package (critical 9.8)
- [CVE-2022-23795](https://insights.sbomify.com/CVE-2022-23795/): [20220303] - Core - User row are not bound to a authentication mechanism (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-15882 and fix it if it is affected.

What it is: CVE-2018-15882 is a critical vulnerability in Joomla Joomla\!, published on 29 Aug 2018. 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-2018-15882 in the wild and no public exploit code.

Affected product: Joomla Joomla\!. 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-2018-15882/ (Markdown: https://insights.sbomify.com/CVE-2018-15882/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-15882
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-15882
- OSV: https://osv.dev/vulnerability/CVE-2018-15882

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-15882/
Summaries are generated and may contain mistakes; the official description above is the record.