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CVE-2026-15210 – Unauthenticated Account Takeover via OTP Brute Force – Login/Signup with Phone Numb

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Summary

CVE-2026-15210 is an improper authentication vulnerability (CWE-287) in the Login/Signup with Phone Number, OTP Verification WordPress plugin in all versions before 1.8.71. Because the plugin does not limit OTP verification attempts and does not invalidate a one-time login code after a wrong guess, an unauthenticated attacker can brute-force the short numeric code and take over any account, including an administrator’s. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The plugin enforces no rate limiting on OTP verification attempts and fails to invalidate a one-time login code after an incorrect guess.
  • Trigger conditions: An unauthenticated user can request a login code for any account, and the login code is a short numeric OTP.
  • Attack vector: Network. No privileges and no user interaction are required, and attack complexity is low.
  • Impact: An attacker can brute-force the OTP and log in as any user, resulting in full account takeover, including administrator accounts.

Affected software

  • Login/Signup with Phone Number, OTP Verification WordPress plugin — all versions before 1.8.71.

Severity

  • CVSS v3.1 base score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Update the plugin to version 1.8.71 or later, which addresses the vulnerability.
  • If no patch can be applied: Restrict access to the plugin’s OTP login and verification endpoints at the network or WAF layer, and consider disabling or removing the plugin until it can be updated.

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/plugins/miniorange-otp-verification/

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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