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PatchSiren cyber security CVE debrief

CVE-2026-39529 ThemeREX Group CVE debrief

CVE-2026-39529 is a critical vulnerability in the Elementra theme, affecting versions up to 1.0.9. This vulnerability allows for unauthenticated PHP object injection, posing a significant risk to affected systems. With a CVSS score of 9.8, it is considered critical. The vulnerability was published on June 17, 2026, and last modified on the same day. Users of the Elementra theme should take immediate action to mitigate this vulnerability.

Vendor
ThemeREX Group
Product
Elementra
CVSS
CRITICAL 9.8
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 Elementra theme, particularly those using versions up to 1.0.9, should be aware of this vulnerability and take necessary precautions to protect their systems.

Technical summary

CVE-2026-39529 is a critical vulnerability in the Elementra theme, affecting versions up to 1.0.9. The vulnerability allows for unauthenticated PHP object injection, which can lead to severe consequences. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a high impact on confidentiality, integrity, and availability. The weakness associated with this vulnerability is CWE-502.

Defensive priority

high

Recommended defensive actions

  • Update the Elementra theme to a version beyond 1.0.9.
  • Implement additional security measures to restrict PHP object injection.
  • Monitor systems for suspicious activity related to PHP object injection.
  • Consider using a Web Application Firewall (WAF) to detect and prevent attacks.
  • Regularly review and update software and plugins to ensure the latest security patches are applied.
  • Limit access to sensitive areas of the system to authenticated users only.

Evidence notes

The information provided is based on data from the NVD and Patchstack. The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information is available at [ref-4].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39529 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39529

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

  • CVE-2026-39529 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39529

    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.