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CVE-2026-65579 – Unauthenticated PHP Object Injection (RCE) – Agricola WordPress Theme <= 1.21.0

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Summary

CVE-2026-65579 is an unauthenticated PHP Object Injection (deserialization of untrusted data, CWE-502) vulnerability in the Agricola WordPress theme by AxiomThemes. It affects Agricola versions up to and including 1.21.0 and carries a CVSS v3.1 base score of 9.8 (Critical). An unauthenticated, remote attacker can exploit it, potentially leading to full site compromise.

Technical details

  • Root cause: The theme deserializes untrusted, attacker-controllable data without proper validation (CWE-502), allowing injection of crafted PHP objects.
  • Trigger conditions: No authentication and no user interaction are required to reach the vulnerable code path.
  • Attack vector: Network — the flaw is remotely exploitable over HTTP(S) with low attack complexity.
  • Impact: Object injection can be leveraged against available PHP gadget chains, with high impact to confidentiality, integrity, and availability; consequences may include remote code execution and full site takeover.

Affected software

  • Agricola WordPress theme (AxiomThemes) — all versions up to and including 1.21.0.

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Agricola theme to a release later than 1.21.0 once available from the vendor.
  • If no patch is available: Restrict internet-facing access to the affected site, deploy a web application firewall to filter serialized-object payloads in requests, and monitor for anomalous requests targeting the theme. Remove or disable the theme if it is not required.

References

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