Critical severity · published Aug 18, 2026
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
9.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JO
Joomla · Joomla
1.0.0-5.4.6; 6.0.0-6.1.2 · source: vendor, NVD
JF
Joomla! Framework Filesystem package · Joomla! Project
1.0.0-3.3.0; 4.0.0-4.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73373
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73373
Vendor Advisory
https://developer.joomla.org/security-centre/1077-20260810-core-unrestricted-uploads-of-shtml-files.html
Product
https://www.joomla.org/
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