Live Exposure Defense: From CVE to Confirmed Exposure in 12 Hours – See more

Back
New CVE Detected

CVE-2026-73380 – Unauthenticated PHP Object Injection – Popup by Supsystic WordPress Plugin (<= 1.13

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-73380 is an unauthenticated PHP Object Injection vulnerability (CWE-502: Deserialization of Untrusted Data) affecting the Popup by Supsystic WordPress plugin in versions up to and including 1.13.0. Because untrusted, attacker-controlled data is deserialized without authentication, a remote attacker can potentially craft malicious PHP objects that trigger unwanted code execution, data manipulation, or file operations depending on other classes ("gadget chains") available in the WordPress environment. The flaw carries a Critical CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: The plugin passes untrusted input into a PHP deserialization function (e.g., unserialize()), allowing an attacker to supply a crafted serialized object.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network access to a WordPress site running the vulnerable plugin.
  • Attack vector: Network (remote, unauthenticated HTTP request).
  • Impact: Successful exploitation can lead to object injection that, combined with other code present on the target (POP/gadget chains), may enable remote code execution, arbitrary file read/write/delete, or denial of service — impacting confidentiality, integrity, and availability.

Affected software

  • Popup by Supsystic (WordPress plugin) — all versions up to and including 1.13.0
  • Fixed in version 1.13.1

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 Popup by Supsystic plugin to version 1.13.1 or later, which includes security hardening addressing this issue.
  • If immediate patching is not possible:
    • Temporarily deactivate the plugin until the update can be applied.
    • Restrict or monitor unauthenticated requests to WordPress endpoints associated with the plugin via a web application firewall.
    • Review server and application logs for anomalous POST requests or unexpected PHP errors indicative of deserialization attempts.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

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

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.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

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

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge