# CVE-2026-48946: Joomla Extension - getk2.org - Privileged RCE vulnerability in K2 extension for Joomla < 2.26

> A K2 Author can upload a PHP shell via the attachment feature to execute arbitrary code on the server.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **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:** 25 Jun 2026
- **Updated:** 28 Jun 2026
- **Also known as:** GHSA-hmpj-wp8r-7h2p

## What is CVE-2026-48946?

CVE-2026-48946 is a medium-severity vulnerability in getk2.org K2 extension for Joomla, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The K2 frontend article-attachment upload path accepts files whose extension is `.php`, and Apache's standard mod_php matches `\.php$` and executes them under the K2 web user. A K2 Author can upload a `shell.php`, then fetch `/media/k2/attachments/shell.php` and execute arbitrary PHP code in the web server's context.

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

## Which versions are affected by CVE-2026-48946?

It affects 1 product.


Products: Joomlaworks K2.

## How do I fix CVE-2026-48946?

No fix has been published for CVE-2026-48946 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48946 being exploited?

There is no known exploitation of CVE-2026-48946 in the wild and no public exploit code.

## Other vulnerabilities in getk2.org K2 extension for Joomla

- [CVE-2019-19634](https://insights.sbomify.com/CVE-2019-19634/): class.upload.php in verot.net omits .pht from the set of dangerous file extensions (critical 9.8)
- [CVE-2019-19576](https://insights.sbomify.com/CVE-2019-19576/): Remote code execution in verot/class.upload.php (critical 9.8)
- [CVE-2018-7482](https://insights.sbomify.com/CVE-2018-7482/): Path traversal in n/a (high 7.5)
- [CVE-2026-48941](https://insights.sbomify.com/CVE-2026-48941/): Joomla Extension - getk2.org - Unauthenticated folder delete in K2 extension for Joomla < 2.26 (medium 6.5)
- [CVE-2026-48943](https://insights.sbomify.com/CVE-2026-48943/): Joomla Extension - getk2.org - Authenticated user property mass-assignment in K2 extension for Joomla < 2.26 (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48946 and fix it if it is affected.

What it is: CVE-2026-48946 is a medium-severity vulnerability in getk2.org K2 extension for Joomla, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-48946 in the wild and no public exploit code.

Affected product: getk2.org K2 extension for 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-2026-48946/ (Markdown: https://insights.sbomify.com/CVE-2026-48946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48946
- OSV: https://osv.dev/vulnerability/CVE-2026-48946

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48946/
Summaries are generated and may contain mistakes; the official description above is the record.