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Vulnerabilities

Vulnerability · CVE-2026-73373

[20260810] - Core - Unrestricted uploads of SHTML files

Published Aug 17, 2026 · Joomla Joomla

Check if you run it

No confirmed exploitation is on record for CVE-2026-73373. EPSS is 0.65%. Act only if a listed version of Joomla Joomla is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.65%
Remediation
Not established
Affected products
Joomla Joomla

Project: Joomla! SubProject: CMS Impact: High Severity: Low Probability: Low Versions: 1.0.0-5.4.7,6.0.0-6.1.2 Exploit type: Unrestricted Upload of File with Dangerous Type Reported Date: 2026-07-29 Fixed Date: 2026-08-18 CVE Number: CVE-2026-73373 Description The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution. Affected Installs Joomla! CMS versions 1.0.0-5.4.7, 6.0.0-6.1.2 Solution Upgrade to version 5.4.8, 6.1.3 Contact The JSST at the Joomla! Security Centre . Reported By: Valentin Lobstein (Chocapikk)

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-73373

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-73373. EPSS is 0.65%. Act only if a listed version of Joomla Joomla is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.65%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 17, 2026 · Joomla Security

    Detected

    Project: Joomla! SubProject: CMS Impact: High Severity: Low Probability: Low Versions: 1.0.0-5.4.7,6.0.0-6.1.2 Exploit type: Unrestricted Upload of File with Dangerous Type Reported Date: 2026-07-29 Fixed Date: 2026-08-18 CVE Number: CVE-2026-73373 Description The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution. A

Sources

  • CVE.orgVulnerability recordCVE-2026-73373

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-73373

    30-day exploitation probability 0.6%

    first.org
  • Joomla SecurityVendor advisoryCVE-2026-73373

    Project: Joomla! SubProject: CMS Impact: High Severity: Low Probability: Low Versions: 1.0.0-5.4.7,6.0.0-6.1.2 Exploit type: Unrestricted Upload of File with Dangerous Type Reported Date: 2026-07-29 Fixed Date: 2026-08-18 CVE Number: CVE-2026-73373 Description The default list of

    developer.joomla.org

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.