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CVE-2026-15291 – Sensitive Information Exposure – Chat Help WordPress Plugin ≤ 3.1.3

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Summary

CVE-2026-15291 is a high-severity sensitive information exposure vulnerability affecting the Chat Help – Click to Chat Button & Form WordPress plugin (by ThemeAtelier), in all versions up to and including 3.1.3. The flaw stems from missing authorization checks (CWE-862) on two REST API endpoints, allowing any unauthenticated, internet-accessible attacker to retrieve collected lead data including customer PII and WordPress account credentials. The vulnerability carries a CVSS v3.1 base score of 7.5 (HIGH) with a full confidentiality impact and no authentication requirement.

Technical details

  • Root cause: CWE-862 (Missing Authorization) — the plugin’s REST API endpoints /wp-json/chat-help/v1/leads and /wp-json/chat-help/v1/leads/{id} perform no authentication or authorization checks, leaving all lead records stored by the plugin’s Single Form layout openly accessible to any caller.
  • Trigger conditions: No user interaction or authentication is required. An attacker needs only network access to the target WordPress site and knowledge of the standard WordPress REST API path structure.
  • Attack vector: Unauthenticated HTTP/HTTPS request directly to the exposed REST API endpoints (AV:N, AC:L, PR:N, UI:N). The endpoints are publicly routable and enumerable on any WordPress installation running the affected plugin.
  • Impact (C:H / I:N / A:N): Exposed data includes customer names, email addresses, phone numbers, and WhatsApp messages submitted via the plugin’s chat form, along with full geolocation records (IP addresses, city, country, ISP, and geographic coordinates) and device fingerprinting data (browser, OS, screen resolution). Critically, for logged-in WordPress users who submitted a form, the endpoints also expose WordPress account credentials: user IDs, usernames, email addresses, and display names. Integrity and availability are unaffected.

Affected software

  • Chat Help – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form (WordPress plugin by ThemeAtelier), all versions up to and including 3.1.3

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Patch immediately: Update the Chat Help plugin to version 3.1.4 or later. Version 3.1.4 (released November 12, 2025) explicitly resolves the broken access control vulnerability in the REST API by enforcing proper authentication and authorization. The current available version is 3.4.2.
  • If immediate patching is not possible: Temporarily disable the Chat Help plugin, or apply a web application firewall rule to block unauthenticated access to the /wp-json/chat-help/v1/leads and /wp-json/chat-help/v1/leads/{id} endpoints.
  • After patching: Audit the leads database for evidence of unauthorized access. If WordPress account credential data belonging to logged-in users may have been exposed, notify affected users and enforce a password reset as a precaution.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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