CVE-2026-22399
Published: 05 March 2026
Summary
CVE-2026-22399 is a high-severity PHP Remote File Inclusion (CWE-98) vulnerability. Its CVSS base score is 8.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 39.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-22399 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability, classified as PHP Remote File Inclusion but enabling PHP Local File Inclusion, in the Mikado-Themes Holmes WordPress theme. This issue affects Holmes versions from n/a through 1.7.
The vulnerability has a CVSS 3.1 score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating exploitation is possible over the network by unauthenticated attackers with no user interaction required, though it demands high attack complexity. Successful exploitation allows attackers to achieve high impacts on confidentiality, integrity, and availability, mapped to CWE-98.
Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/holmes/vulnerability/wordpress-holmes-theme-1-7-local-file-inclusion-vulnerability?_s_id=cve.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9536
Vulnerability details
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in Mikado-Themes Holmes holmes allows PHP Local File Inclusion.This issue affects Holmes: from n/a through <= 1.7.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE-2026-22399 is a remote file inclusion vulnerability in a public-facing WordPress theme, directly enabling exploitation of public-facing applications.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of filenames supplied to PHP include/require statements, preventing local file inclusion by rejecting malicious paths.
Mandates timely identification, reporting, and correction of the specific flaw in the Holmes WordPress theme that enables PHP local file inclusion.
Enforces restrictions on information inputs such as filenames to organization-defined safe types or paths, mitigating improper file inclusion attempts.