# CVE-2026-78078: Joomla Extension - joomshaper.com - Privileged File Upload Bypass via Content Spoofing in Helix Ultimate < 2.2.10

> Attackers can upload malicious files disguised as images in Helix Ultimate, potentially leading to code execution on Joomla sites.

- **Severity:** High 8.9 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Aug 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-wmp3-68pg-cwp7

## What is CVE-2026-78078?

CVE-2026-78078 is a high-severity vulnerability in joomshaper.com Helix Ultimate extension for Joomla, published on 31 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Joomla Extension - joomshaper.com - Privileged File Upload Bypass via Content Spoofing in Helix Ultimate < 2.2.10 - Image uploads previously validated only file extension and basic size parameters. Non-image files disguised with raster extensions could be uploaded. Added strict MIME verification and GD binary raster decoding (imagecreatefromstring) to reject invalid/malformed images fail-closed.

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

## Which versions are affected by CVE-2026-78078?


## How do I fix CVE-2026-78078?

No fix has been published for CVE-2026-78078 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-78078 being exploited?

There is no known exploitation of CVE-2026-78078 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78078 and fix it if it is affected.

What it is: CVE-2026-78078 is a high-severity vulnerability in joomshaper.com Helix Ultimate extension for Joomla, published on 31 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-78078 in the wild and no public exploit code.

Affected product: joomshaper.com Helix Ultimate 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-2026-78078/ (Markdown: https://insights.sbomify.com/CVE-2026-78078/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78078
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78078
- OSV: https://osv.dev/vulnerability/CVE-2026-78078

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78078/
Summaries are generated and may contain mistakes; the official description above is the record.