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CVE-2026-11387 – Privilege Escalation via Account Takeover – SMS Alert WordPress Plugin ≤ 3.9.5

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Summary

CVE-2026-11387 is a critical improper authentication vulnerability (CVSS 9.8) affecting the SMS Alert – SMS & OTP for WooCommerce, Order Notifications & Abandoned Cart Recovery WordPress plugin, developed by Cozy Vision Technologies Pvt. Ltd., in all versions up to and including 3.9.5. An unauthenticated remote attacker can exploit a broken identity-validation flaw in the plugin’s OTP-based password reset flow to silently change any user’s — including an administrator’s — registered email address, then trigger a standard password reset to fully take over that account. A patched release, version 3.9.6, was published on June 27, 2026.

Technical details

  • Root cause: The plugin fails to properly validate a user’s identity before allowing account details to be modified (CWE-287: Improper Authentication). Specifically, the OTP verification step for password resets can be bypassed, allowing unauthenticated requests to update the target account’s email address.
  • Trigger conditions: The vulnerability is exploitable only on sites where (1) OTP verification for password resets is enabled in the plugin settings, and (2) the target user account (including administrator accounts) has a phone number registered for OTP delivery.
  • Attack vector: Network-accessible; no authentication, no privileges, and no user interaction are required. An attacker sends crafted unauthenticated HTTP requests to the plugin’s account-update endpoint to overwrite the target email address, then initiates WordPress’s standard password reset flow against the attacker-controlled email.
  • Impact: Full account takeover of any targeted user account, including site administrators. Successful exploitation results in complete confidentiality, integrity, and availability compromise of the WordPress installation (C:H/I:H/A:H).

Affected software

  • SMS Alert – SMS & OTP for WooCommerce, Order Notifications & Abandoned Cart Recovery — all versions ≤ 3.9.5

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 action — patch: Update the SMS Alert plugin to version 3.9.6 or later, available from the WordPress.org plugin repository. Version 3.9.6 was released June 27, 2026 and addresses this vulnerability.
  • If immediate patching is not feasible: As a temporary measure, disable the OTP verification for password resets feature in the plugin’s settings. This removes the vulnerable code path and prevents exploitation until the plugin can be updated.
  • General hygiene: Audit WordPress administrator accounts for unexpected email address changes or recently created accounts, as these may indicate prior exploitation.

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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