# CVE-2026-57739: AcyMailing SMTP Newsletter SQL injection

Source: https://junglewise.ai/threats/cve-2026-57739-acymailing-smtp-newsletter-sql-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13. Updated: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2026-57739 · Severity: critical · CVSS 9.3 · Published 2026-07-13

AcyMailing SMTP Newsletter, a popular WordPress plugin used for managing email marketing and newsletters, contains a critical security flaw. An attacker can use this vulnerability to interact directly with the website's database without needing a password. This could lead to the theft of sensitive customer information, subscriber lists, or other private data stored on the site.

Technologies: [AcyMailing Newsletter Team AcyMailing SMTP Newsletter](https://junglewise.ai/threats/technologies/acymailing-smtp-newsletter). Vendors: [AcyMailing Newsletter Team](https://junglewise.ai/threats/vendors/acymailing-newsletter-team).

## Quick answers

**Is CVE-2026-57739 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57739 being exploited in the wild.

**How severe is CVE-2026-57739?** Critical severity, with a CVSS score of 9.3, published 13 July 2026.

**Which products and versions are affected?** AcyMailing Newsletter Team AcyMailing SMTP Newsletter <= 10.11.0.

**Is there a fix for CVE-2026-57739?** A patch was published: 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-2026-57739 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-57739?** Check whether you run AcyMailing Newsletter Team AcyMailing SMTP Newsletter at an affected version. 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

The AcyMailing SMTP Newsletter plugin for WordPress (versions up to and including 10.11.0) is vulnerable to Blind SQL Injection due to improper neutralization of special elements in SQL commands. The vulnerability allows an unauthenticated remote attacker to execute arbitrary SQL queries against the backend database. By leveraging blind injection techniques, an attacker can exfiltrate sensitive data such as user credentials, configuration details, and subscriber information. The issue is fixed in version 10.11.1.

## Affected products

- AcyMailing Newsletter Team AcyMailing SMTP Newsletter <= 10.11.0

## Timeline

- 2026-04-29: disclosed: Reported by kai63001
- 2026-07-06: advisory: Patchstack advisory published
- 2026-07-13: advisory: NVD published CVE-2026-57739
- patched: Fixed in version 10.11.1

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/Wordpress/Plugin/acymailing/vulnerability/wordpress-acymailing-smtp-newsletter-plugin-10-10-2-sql-injection-vulnerability?_s_id=cve](https://patchstack.com/database/Wordpress/Plugin/acymailing/vulnerability/wordpress-acymailing-smtp-newsletter-plugin-10-10-2-sql-injection-vulnerability?_s_id=cve)