CVE-2026-40383Network attack vector

Authenticated local file inclusion via unsanitized template name

Published May 26, 2026 · Updated May 26, 2026

Local file inclusion in Joomla! CMS 3.2.1 through 5.4.5 and 6.0.0 through 6.1.0 allows remote authenticated users to include local files. HtmlView::loadTemplate sanitizes the layout filename but leaves the layout template name unsanitized before substituting it into the template search path. Remote authenticated users need high privileges and deployment-specific conditions; inclusion executes a selected PHP file in the server process.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Local file inclusion in Joomla! CMS 3.2.1 through 5.4.5 and 6.0.0 through 6.1.0 allows remote authenticated users to include local files. HtmlView::loadTemplate sanitizes the layout filename but leaves the layout template name unsanitized before substituting it into the template search path. Remote authenticated users need high privileges and deployment-specific conditions; inclusion executes a selected PHP file in the server process.

The record

CVE
CVE-2026-40383
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-22
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.1-5.4.5
  2. Affected versionversion=6.0.0-6.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Joomla! Project · Joomla! CMSversion=3.2.1-5.4.5; version=6.0.0-6.1.0

Published CVSS scores

7.5Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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