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CVE-2026-65577 – Unauthenticated PHP Object Injection – Advice WordPress Theme <= 1.18.0

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Summary

CVE-2026-65577 is an unauthenticated PHP Object Injection (insecure deserialization) vulnerability in the AncoraThemes "Advice" WordPress theme affecting all versions up to and including 1.18.0. It carries a CVSS v3.1 base score of 9.8 (Critical), as it can be exploited over the network without authentication or user interaction.

Technical details

  • Root cause: Deserialization of untrusted data (CWE-502), allowing an attacker to inject crafted serialized PHP objects that are processed by the theme.
  • Trigger conditions: No authentication or user interaction is required; a remote attacker can supply malicious serialized input to vulnerable theme code.
  • Attack vector: Network (AV:N) with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: When a suitable POP gadget chain is present, object injection can lead to high impact on confidentiality, integrity, and availability, potentially enabling full site compromise.

Affected software

  • AncoraThemes Advice WordPress Theme — all versions up to and including 1.18.0.

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 Advice theme to a version later than 1.18.0 once a fixed release is available from the vendor.
  • If no patch: Restrict or filter untrusted input reaching the site, deploy a web application firewall to block serialized PHP object payloads, and limit exposure of the affected theme endpoints until an update can be applied.

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 response body: /wp-content/themes/advice/

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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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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