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CVE-2026-40758 Elated-Themes CVE debrief

CVE-2026-40758 is a high-severity vulnerability in the Léonie theme, affecting versions up to 1.2.1. This vulnerability allows unauthenticated attackers to inject PHP objects, potentially leading to arbitrary code execution. The CVSS score for this vulnerability is 8.1, indicating a high level of severity. Organizations using the affected Léonie theme versions should take immediate action to mitigate this vulnerability. The vulnerability was published on June 17, 2026, and has since been modified on the same day. Users of the Léonie theme should update to a patched version as soon as possible.

Vendor
Elated-Themes
Product
Léonie
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

Administrators and users of the Léonie theme, particularly those using versions up to 1.2.1, should be aware of this vulnerability and take necessary precautions. This includes updating to a patched version of the theme and monitoring for potential exploitation attempts.

Technical summary

CVE-2026-40758 is an unauthenticated PHP object injection vulnerability in the Léonie theme, affecting versions up to 1.2.1. The vulnerability has a CVSS score of 8.1 and is classified as CWE-502. The attack vector is network-based, and the vulnerability requires no user interaction. Successful exploitation could lead to arbitrary code execution.

Defensive priority

High

Recommended defensive actions

  • Update the Léonie theme to a patched version (if available).
  • Restrict access to the theme's administrative interface.
  • Implement a web application firewall (WAF) to detect and prevent exploitation attempts.
  • Regularly monitor for updates and security advisories related to the Léonie theme.
  • Consider using a security scanner to identify potential vulnerabilities.
  • Limit network exposure for the affected system.

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and Patchstack. The CVE record and NVD detail pages provide further information on this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40758 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40758

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

  • CVE-2026-40758 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40758

    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.