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PatchSiren cyber security CVE debrief

CVE-2026-112859 ThemeREX Group CVE debrief

A critical vulnerability was found in the WordPress Little Birdies theme, versions up to and including 1.3.16. This issue allows for PHP Object Injection due to the deserialization of untrusted data. The vulnerability has a CVSS score of 9.8, indicating a high severity level. The vulnerability was reported by Patchstack and is documented in the CVE Program record and the NVD vulnerability detail page. Defenders responsible for WordPress installations using the Little Birdies theme should assess exposure and prioritize remediation. This includes administrators, security teams, and developers who manage WordPress sites. The vulnerability could lead to significant impact if exploited,

Vendor
ThemeREX Group
Product
Little Birdies
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-23
Original CVE updated
2026-10-24
Advisory published
2026-10-23
Advisory updated
2026-10-24

Who should care

Defenders responsible for WordPress installations using the Little Birdies theme should assess exposure and prioritize remediation. This includes administrators, security teams, and developers who manage WordPress sites.

Why it matters

CVE-2026-112859 is a critical PHP Object Injection vulnerability in the WordPress Little Birdies theme. Defenders should prioritize patching or mitigating this vulnerability to prevent potential arbitrary code execution and significant impact.

  • Potential for arbitrary code execution if exploited.
  • High CVSS score indicating critical severity.
  • Possible impact on confidentiality, integrity, and availability.

Technical summary

The Little Birdies theme for WordPress, versions up to and including 1.3.16, is vulnerable to PHP Object Injection. This is due to the deserialization of untrusted data, which can lead to arbitrary code execution. The vulnerability has been assigned a CVSS score of 9.8, indicating critical severity.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability as it could lead to significant impact if exploited.

Recommended defensive actions

  • Patch or update the Little Birdies theme to a version beyond 1.3.16.
  • Implement additional security measures to prevent object injection attacks.
  • Monitor systems for suspicious activity related to this vulnerability.

Evidence notes

The vulnerability was reported by Patchstack and is documented in the CVE Program record and the NVD vulnerability detail page. The CVE record was published on 2026-10-23T13:00:17.469Z and has not been modified since then. The source item providing details on the vulnerability has limited information, and defenders should verify the affected scope and severity with the official advisory or CVE record.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-112859 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-112859

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

  • CVE-2026-112859 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-112859

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

Supplemental references

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.