CVE-2026-14920: AcyMailing unauthenticated SQL injection in subscription parameter

CVE-2026-14920 · Severity: high · CVSS 8.2 · Published 2026-08-02

AcyMailing is a popular WordPress plugin for email marketing and newsletter management, used on over 7,000 sites. A critical SQL injection flaw in its public-facing unsubscribe function allows attackers to read sensitive database information—including user credentials and API keys—without logging in. An attacker only needs to register as a subscriber (the default configuration allows public registration without CAPTCHA) and send a specially crafted request to extract or modify data.

Quick answers

Is CVE-2026-14920 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-14920 being exploited in the wild.
How severe is CVE-2026-14920?
High severity, with a CVSS score of 8.2, published 2 August 2026.
Which products and versions are affected?
AcyMailing AcyMailing <= 10.11.0.
Is there a fix for CVE-2026-14920?
A patch was published on 2026: Fixed in version 10.11.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-14920 attacked?
It is attacked over the network.
Am I affected by CVE-2026-14920?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is an unauthenticated SQL injection (CWE-89) in AcyMailing's front-end subscription handler. The vulnerability exists in the `unsubscribe` task (declared as publicly accessible in `FrontusersController.php`), which accepts a `subscription[]` parameter from user input. The plugin passes this array directly into a SQL `IN()` clause via `implode()` without integer coercion, unlike two similar code paths in the same file that correctly call `acym_arrayToInteger()` first. The request sanitizer `acym_getVar()` removes slashes and cleans values, but the cleanup function has no handler for arrays or integers, allowing payloads like `0) UNION SELECT SLEEP(5) FROM DUAL WHERE 1 OR (1` to reach the database query untouched. Attack preconditions are minimal: the default configuration allows visitor self-registration and has CAPTCHA disabled. The injected SQL executes in a `DELETE` statement's sub-select, enabling blind data extraction via time-based or error-based techniques. A patch is available in version 10.11.1.

Affected products

  • AcyMailing AcyMailing <= 10.11.0

Timeline

  • 2026-08-02: disclosed
  • 2026: patched: Fixed in version 10.11.1

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.