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ChapterOne WordPress Theme EUVDEUVD-2026-37596

| CVE-2026-40731 HIGH
PHP Remote File Inclusion (CWE-98)
2026-06-17 Patchstack
8.1
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.5 MEDIUM

Network-reachable PHP LFI without auth (AV:N/PR:N/UI:N); AC:H reflects unknown specific parameter/path; primary impact is file disclosure (C:H) with limited integrity and no inherent availability impact absent confirmed RCE chain.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Jun 17, 2026 - 12:18 vuln.today

DescriptionCVE.org

Unauthenticated Local File Inclusion in ChapterOne <= 1.7 versions.

AnalysisAI

Unauthenticated local file inclusion in the Mikado-Themes ChapterOne WordPress theme (versions 1.7 and earlier) allows remote attackers to coerce the PHP application into including arbitrary local files via crafted requests. Successful exploitation can disclose sensitive files such as wp-config.php and, depending on server configuration, lead to PHP code execution by including attacker-influenced content. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify WordPress site running ChapterOne ≤1.7
Delivery
Send crafted request to vulnerable theme endpoint
Exploit
Inject path traversal into include parameter
Execution
PHP includes arbitrary local file
Persist
Exfiltrate wp-config.php or escalate via log poisoning
Impact
Use DB credentials or RCE for full site compromise

Vulnerability AssessmentAI

Exploitation Exploitation requires that the target WordPress site has the Mikado-Themes ChapterOne theme installed and active at version 1.7 or earlier, and that the attacker can reach the vulnerable theme endpoint over HTTP/HTTPS - typical for any internet-exposed WordPress install. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, 8.1) signals unauthenticated remote reach with high impact across confidentiality, integrity and availability, tempered by high attack complexity - likely reflecting that exploitation depends on specific parameter knowledge or a particular request shape rather than a trivial GET. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker sends a crafted HTTP request to a ChapterOne theme endpoint (for example an AJAX action or template-loading parameter) supplying a traversal-encoded path that resolves to wp-config.php, retrieving database credentials and WordPress secret keys from the response. With those credentials the attacker can pivot to direct database access or, if log files or uploaded content are includable, escalate the LFI into PHP code execution by including a poisoned log entry or uploaded image containing PHP.
Remediation No vendor-released patched version is identified in the available data for ChapterOne, so the primary action is to monitor Mikado-Themes and the Patchstack advisory at https://patchstack.com/database/wordpress/theme/chapterone/vulnerability/wordpress-chapterone-theme-1-7-local-file-inclusion-vulnerability for an updated release above 1.7 and apply it immediately when published. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Audit all WordPress installations for ChapterOne theme v1.7 or earlier; restrict web server file permissions to deny wp-config.php access. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-37596 vulnerability details – vuln.today

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