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CVE-2026-40383

Joomla Joomla! path traversal

9.8 CRITICALEPSS 0.56%
  1. Published26 May 2026

Description

An improper validation of user-supplied input leads to a local file inclusion vulnerability.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Joomla Joomla!≥ 3.2.1 < 5.4.6 · ≥ 6.0.0 < 6.1.1

Remediation

Fixed in
Joomla Joomla!≥ 5.4.6

References

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Frequently asked

Is CVE-2026-40383 being actively exploited?

CVE-2026-40383 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-40383?

CVE-2026-40383 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-40383?

Affected products include Joomla Joomla!.

How do I fix CVE-2026-40383?

Upgrade affected software to a fixed version, for example Joomla Joomla! 5.4.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40383 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.