CVE-2026-56292: AcyMailing SQL Injection Vulnerability – Patch Guidance

Technical summary

CVE-2026-56292 is a CWE-89 SQL injection vulnerability in the AcyMailing component for Joomla. The flaw allows an unauthenticated, remote attacker to craft malicious input that is unsafely interpolated into SQL queries. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) indicates a network-accessible attack surface with low complexity, no authentication requirement, and high confidentiality impact. Integrity and availability are not affected by this particular instance.

Business impact

Organizations running AcyMailing for email campaign management face direct risk of customer email lists, subscriber preferences, campaign content, and potentially other Joomla database records being extracted. For businesses reliant on AcyMailing for customer communication, a breach could compromise customer trust, trigger regulatory notification requirements under data protection laws, and disrupt operational email workflows. The exposure is particularly acute for multi-user Joomla installations where the marketing team's data may include sensitive customer information.

Affected systems

AcyMailing versions below 10.11.1 are vulnerable. Any Joomla installation with this extension installed and exposed to network traffic requires immediate attention. The vulnerability does not depend on specific hosting environments or configurations—any unpatched instance is at risk.

Exploitability

The attack requires no authentication and can be triggered from the public internet, making this highly exploitable. An attacker needs only to send a crafted HTTP request containing SQL injection payload to an accessible AcyMailing endpoint. No user interaction or complex setup is required. Automated scanning and exploitation tooling are likely to emerge or may already exist in underground security communities.

Remediation

Update AcyMailing to version 10.11.1 or later immediately. This patch version addresses the SQL injection vulnerability. Organizations should verify patch availability and applicability in their Joomla environment before deployment. As an interim measure, if immediate patching is impossible, restrict network access to AcyMailing endpoints via firewall rules or Web Application Firewall (WAF) policies until a patch can be applied.

Patch guidance

Visit the official AcyMailing vendor website or your Joomla extension manager to confirm availability of version 10.11.1 or later. Follow your organization's change management procedures, including testing in a staging environment before production deployment. Verify successful patch installation by checking the extension version in the Joomla administrator panel. Document the patching activity for compliance and incident response records.

Detection guidance

Monitor for HTTP requests to AcyMailing endpoints containing SQL keywords or unusual special characters (e.g., single quotes, UNION, SELECT) in query parameters. Review web application firewall logs for blocked SQL injection attempts. Check Joomla database access logs for unexpected queries originating from web processes. Conduct a database audit to identify any tables or records accessed during the window of exposure, particularly targeting subscriber and campaign data. Enable query logging if not already active to establish a baseline of anomalous database activity.

Why prioritize this

This vulnerability merits immediate prioritization due to HIGH severity, unauthenticated remote exploitability, and direct access to sensitive customer data. The absence of KEV (Known Exploited Vulnerability) listing does not reduce urgency; publicly disclosed SQL injection flaws are frequently exploited within days. Organizations managing customer communications via AcyMailing should treat this as critical.

Risk score, explained

The CVSS 3.1 score of 7.5 (HIGH) reflects the combination of network-level accessibility, zero authentication requirement, and high confidentiality impact. The vulnerability does not achieve a CRITICAL score only because the attack vector does not affect system integrity or availability. However, in practical business terms, unauthorized access to customer email lists and campaign data can be as damaging as full system compromise; security teams should weight business context heavily when deciding response urgency.

Frequently asked questions