# CVE-2026-73373: Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2

> Attackers can upload SHTML files to execute arbitrary code on servers configured to process them.

- **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:** Yes
- **Published:** 18 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** BIT-joomla-2026-73373, GHSA-38c6-5ffm-cv2j

## What is CVE-2026-73373?

CVE-2026-73373 is a high-severity vulnerability in Joomla Joomla\!, published on 18 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2 - The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution.

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

## Which versions are affected by CVE-2026-73373?

1 open source package ship an affected version, including joomla. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `joomla` | Bitnami | From 1.0.0 | 5.4.8, 6.1.3 |

Products: Joomla Joomla\!.

## How do I fix CVE-2026-73373?

Upgrade joomla to a fixed version for your release line: 5.4.8 or 6.1.3.

## Is CVE-2026-73373 being exploited?

There is no known exploitation of CVE-2026-73373 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-2026-73373 and fix it if it is affected.

What it is: CVE-2026-73373 is a high-severity vulnerability in Joomla Joomla\!, published on 18 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-73373 in the wild and no public exploit code.

Affected packages and fixed versions:
- joomla (Bitnami): affected from 1.0.0; fixed in 5.4.8, 6.1.3

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-2026-73373/ (Markdown: https://insights.sbomify.com/CVE-2026-73373/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73373
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73373
- OSV: https://osv.dev/vulnerability/CVE-2026-73373

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73373/
Summaries are generated and may contain mistakes; the official description above is the record.