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CVE-2026-16030 – Authentication Bypass / Account Takeover – MStore API WordPress Plugin before 4.21.

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Summary

CVE-2026-16030 is an improper authentication vulnerability (CWE-287) in the MStore API WordPress plugin in versions prior to 4.21.0. The plugin does not correctly verify the cryptographic signature of the token used for phone-based login, allowing an unauthenticated attacker who knows a registered user’s phone number to forge a token and take over that account, including administrator accounts. It carries a HIGH severity rating with a CVSS v3.1 base score of 8.1.

Technical details

  • Root cause: The cryptographic signature of the token used for phone-based login is not correctly verified.
  • Trigger conditions: An attacker needs only knowledge of a registered user’s phone number; no prior authentication or user interaction is required.
  • Attack vector: Network — the flaw is reachable remotely against the plugin’s phone-login authentication flow.
  • Impact: Token forgery leads to full account takeover of the targeted user, including administrator accounts, resulting in complete compromise of confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • MStore API WordPress plugin: all versions before 4.21.0.

Severity

  • CVSS v3.1 base score: 8.1 (HIGH)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the MStore API plugin to version 4.21.0 or later, where the token signature is verified correctly.
  • If no patch can be applied yet: Restrict network access to the plugin’s phone-based login authentication endpoints and monitor for anomalous phone-login activity and unexpected privilege changes on administrator accounts.

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/mstore-api/

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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