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CVE-2026-73376 – Unauthenticated PHP Object Injection – Ultimate Maps by Supsystic WordPress Plugin

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Summary

CVE-2026-73376 is an unauthenticated PHP Object Injection vulnerability (CWE-502, Deserialization of Untrusted Data) affecting the Ultimate Maps by Supsystic WordPress plugin in versions prior to 1.5.0. The plugin deserializes untrusted input without adequate validation, allowing a remote, unauthenticated attacker to submit crafted serialized PHP objects to the site. The flaw carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the plugin deserializes untrusted data (PHP Object Injection / CWE-502, CAPEC-586 Object Injection) without proper input sanitization.
  • Trigger conditions: no authentication, privileges, or user interaction are required to trigger the flaw.
  • Attack vector: network-based (remote), low attack complexity.
  • Impact: successful exploitation can affect confidentiality, integrity, and availability of the affected system; depending on other classes/gadget chains present on the WordPress install, object injection of this type can potentially lead to remote code execution, data manipulation, or denial of service.

Affected software

  • Ultimate Maps by Supsystic (WordPress plugin), all versions prior to 1.5.0.
  • Fixed in version 1.5.0 and later.

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 Ultimate Maps by Supsystic WordPress plugin to version 1.5.0 or later.
  • If a patch cannot be applied immediately: consider deactivating the plugin until it can be updated, restrict access to the site’s admin and plugin endpoints, and monitor for unusual serialized-data submissions in requests to the site.

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/plugins/ultimate-maps-by-supsystic/

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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