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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40731 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40731

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40731 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40731

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.