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CVE-2026-65575 – Unauthenticated PHP Object Injection – Accalia WordPress Theme ≤ 1.5.3

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Summary

CVE-2026-65575 is an unauthenticated PHP Object Injection vulnerability in the Accalia WordPress theme by AncoraThemes, affecting all versions up to and including 1.5.3. It carries a CVSS v3.1 base score of 9.8 (Critical) and can be exploited remotely over the network without authentication or user interaction.

Technical details

  • Root cause: Deserialization of untrusted data (CWE-502) within the theme, allowing attacker-controlled input to be unserialized into PHP objects.
  • Trigger conditions: An unauthenticated attacker supplies crafted serialized data that the theme deserializes.
  • Attack vector: Network (AV:N), low complexity, no privileges and no user interaction required.
  • Impact: Object injection can lead to high impact on confidentiality, integrity, and availability, depending on the PHP object chains ("gadgets") available in the WordPress installation and its plugins.

Affected software

  • Accalia WordPress theme (AncoraThemes) — all versions ≤ 1.5.3.

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector string: 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 Accalia theme to a fixed release newer than 1.5.3 as soon as one is made available by the vendor.
  • If no patch is available: Restrict or filter unauthenticated requests to the affected theme, deploy a web application firewall rule to block PHP object injection payloads (serialized data in request parameters), and remove or disable the theme if it is not required.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: /wp-content/themes/accalia/

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Confirmation of verified exploitable assets
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