Cyber Resilience

CVE-2026-40383

High

Published: 26 May 2026

Published
26 May 2026
Modified
27 May 2026
KEV Added
—
Patch
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CVSS Score v4 7.5 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0048 38.0th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-40383 is a high-severity Path Traversal (CWE-22) vulnerability in Joomla Joomla\!. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability details

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

CWE(s)
CWE-22

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
Why these techniques?

LFI via path traversal (CWE-22) directly enables remote exploitation of public web apps (T1190) and arbitrary local file reads (T1005).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-23899Same product: Joomla Joomla\!
CVE-2026-35221Same product: Joomla Joomla\!
CVE-2024-40749Same product: Joomla Joomla\!
CVE-2026-21629Same product: Joomla Joomla\!
CVE-2026-21630Same product: Joomla Joomla\!
CVE-2026-35222Same product: Joomla Joomla\!
CVE-2024-40748Same product: Joomla Joomla\!
CVE-2026-48904Same product: Joomla Joomla\!
CVE-2026-48899Same product: Joomla Joomla\!
CVE-2026-48898Same product: Joomla Joomla\!

Affected Assets

joomla
joomla\!
3.2.1 — 5.4.6 · 6.0.0 — 6.1.1

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-10 Information Input Validation
addresses: CWE-22

Validates pathnames and filenames to prevent traversal outside intended directories.

References