# CVE-2026-48940: Joomla Extension - getk2.org - Stored-XSS in K2 extension for Joomla < 2.26

> Stored XSS in K2 extension allows attackers to inject scripts via video embed fields, potentially compromising user sessions and site integrity.

- **Severity:** Low 3.4 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Jun 2026
- **Updated:** 28 Jun 2026
- **Also known as:** GHSA-4gq9-7rp6-9749

## What is CVE-2026-48940?

CVE-2026-48940 is a low-severity cross-site scripting vulnerability in getk2.org K2 extension for Joomla, published on 25 Jun 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A Joomla user with K2 "create item" rights (Author tier by default) can submit an article whose `embedVideo` POST field contains a raw `<script>` tag; K2 stores it verbatim and renders it unescaped to any visitor of the article page.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-48940?

It affects 1 product.


Products: Joomlaworks K2.

## How do I fix CVE-2026-48940?

No fix has been published for CVE-2026-48940 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48940 being exploited?

There is no known exploitation of CVE-2026-48940 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-2026-48940 and fix it if it is affected.

What it is: CVE-2026-48940 is a low-severity cross-site scripting vulnerability in getk2.org K2 extension for Joomla, published on 25 Jun 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-48940 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-2026-48940/ (Markdown: https://insights.sbomify.com/CVE-2026-48940/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48940
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48940
- OSV: https://osv.dev/vulnerability/CVE-2026-48940

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48940/
Summaries are generated and may contain mistakes; the official description above is the record.