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PatchSiren cyber security CVE debrief

CVE-2026-40731 Mikado-Themes CVE debrief

CVE-2026-40731 is a high-severity vulnerability in ChapterOne theme versions <= 1.7, allowing unauthenticated local file inclusion. The vulnerability has a CVSS score of 8.1 and is considered HIGH. The CVE record was published on 2026-06-17T13:20:35.700Z and was last modified on 2026-06-17T15:16:49.890Z. This vulnerability may allow attackers to access sensitive files, potentially leading to information disclosure or code execution.

Vendor
Mikado-Themes
Product
ChapterOne
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

Users of ChapterOne theme versions <= 1.7 should prioritize patching this vulnerability to prevent potential exploitation. This includes administrators and security teams responsible for maintaining and securing websites that use the affected theme.

Technical summary

The vulnerability is an unauthenticated local file inclusion in ChapterOne theme versions <= 1.7. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a high severity vulnerability. This type of vulnerability can allow attackers to include files from the local file system, potentially leading to sensitive information disclosure or arbitrary code execution.

Defensive priority

High priority should be given to patching this vulnerability, as it is considered HIGH severity and has a high CVSS score.

Recommended defensive actions

  • Apply the patch or update to a version greater than 1.7
  • Review and verify the ChapterOne theme version
  • Monitor for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is reported by [email protected] and is related to CWE-98. The NVD entry is currently Deferred. Evidence is limited, and defenders should verify the ChapterOne theme version and review potential file inclusion risks.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-06-17T13:20:35.700Z and has not been modified since then. The NVD entry is currently Deferred.