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CVE-2026-14920 – Unauthenticated SQL Injection – AcyMailing for Joomla before 10.11.1

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Summary

CVE-2026-14920 is an unauthenticated SQL injection vulnerability in the AcyMailing extension for Joomla. The flaw lets an anonymous, network-based attacker inject arbitrary SQL through the subscription[] request parameter, exposing sensitive database contents. It affects all versions before 10.11.1 and is rated High severity (CVSS 8.2).

Technical details

  • Root cause: The subscription[] array is passed into a SQL IN() clause without integer coercion or sanitization; the vulnerable unsubscribe() code path directly concatenates user input into the query instead of calling the array-to-integer coercion used by sibling methods.
  • Trigger conditions: Exploitation targets the unauthenticated unsubscribe task. No account is required, as the public subscribe task allows self-registration; a queued message for the attacker’s subscriber record is a precondition.
  • Attack vector: Network, low complexity, no privileges, no user interaction.
  • Impact: Blind SQL injection enabling exfiltration of arbitrary database tables (High confidentiality impact), with limited integrity impact (Low) and no availability impact.

Affected software

  • AcyMailing for Joomla, all versions up to and including 10.11.0 (before 10.11.1).

Severity

  • CVSS v3.1 base score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Upgrade AcyMailing to version 10.11.1 or later.
  • If no patch can be applied: Restrict or filter public access to the AcyMailing front-end unsubscribe/frontusers endpoints, disable open self-registration where feasible, and monitor for anomalous requests containing subscription[] parameters until the update is deployed.

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: /components/com_acymailing/

References

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