Arbitrary file upload in Joomla Joomla\!
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 - The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Joomla Joomla\!
- Joomla! Project Cms — versions 1.0.0-5.4.6, 6.0.0-6.1.2
- Joomla! Project Framework Filesystem Package — versions 1.0.0-3.3.0, 4.0.0-4.2.0
Weakness classification (CWE)
References
- developer.joomla.org/security-centre/20260810-core-unrestricted-uploads-of-shtm…
- www.joomla.org/ (Product, product)
- developer.joomla.org/security-centre/1077-20260810-core-unrestricted-uploads-of… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-73373?
- CVE-2026-73373 is a critical-severity vulnerability in Joomla Joomla\!, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-08-18.
- How severe is CVE-2026-73373?
- Critical severity. CVSS v3 base score is 9.8 out of 10.