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CVE-2026-65578 – Unauthenticated PHP Object Injection (RCE) – Agora WordPress Theme <= 1.9

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Summary

CVE-2026-65578 is an unauthenticated PHP Object Injection vulnerability (CWE-502) in the Agora WordPress theme by AncoraThemes, affecting versions 1.9 and earlier. It carries a CVSS v3.1 base score of 9.8 (Critical) and can lead to full site compromise when a suitable gadget chain is present.

Technical details

  • Root cause: The theme deserializes untrusted, attacker-controlled input, allowing injection of arbitrary PHP objects (CWE-502).
  • Trigger conditions: No authentication, no user interaction, and low attack complexity are required to reach the vulnerable deserialization path.
  • Attack vector: Network — a remote, unauthenticated attacker sends crafted input to the affected theme.
  • Impact: Injected PHP objects can be abused via property-oriented programming (POP) gadget chains to achieve high impact on confidentiality, integrity, and availability, up to full site takeover.

Affected software

  • Agora WordPress theme (AncoraThemes) — versions 1.9 and earlier (<= 1.9).

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: No fixed version is listed in the CVE record at the time of writing. Monitor AncoraThemes for an updated release and upgrade as soon as a patched version is published.
  • If no patch: Restrict or disable the Agora theme until a fix is available. Deploy a web application firewall (WAF) rule to block serialized PHP object payloads in requests, restrict access to affected endpoints, and monitor for anomalous requests targeting the theme.

References

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