# CVE-2026-53756: Emlog CMS Pro blind SQL injection in User_Model::getUserDataByLogin

Source: https://junglewise.ai/threats/cve-2026-53756-emlog-cms-pro-blind-sql-injection-in-user-model  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-04. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-53756 · Severity: medium · CVSS 4.9 · Published 2026-09-04

Emlog is an open-source website building system used for creating and managing websites. Prior to version 2.6.16, a blind SQL injection vulnerability in the user authentication mechanism allows attackers who can forge an AUTH_KEY HMAC signature to extract sensitive database information through time-based inference, potentially leading to unauthorized data access.

Vendors: [Emlog](https://junglewise.ai/threats/vendors/emlog).

## Quick answers

**Is CVE-2026-53756 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53756 being exploited in the wild.

**How severe is CVE-2026-53756?** Medium severity, with a CVSS score of 4.9, published 4 September 2026.

**Which products and versions are affected?** Emlog CMS Pro prior to 2.6.16.

**Is there a fix for CVE-2026-53756?** A patch was published on 2026-06-04: version 2.6.16 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-53756 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-53756?** Check whether you run Emlog CMS Pro 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 vulnerability is a blind SQL injection (CWE-89) in the User_Model::getUserDataByLogin() method, where the $account parameter is directly interpolated into SQL queries without sanitization. The vulnerable code path is reached during auth cookie validation, where an attacker must forge a valid HMAC signature using the AUTH_KEY to inject malicious SQL into the $username variable. An authenticated attacker (or one with knowledge of AUTH_KEY) can perform time-based blind SQL injection to extract database contents. The vulnerability has been patched in version 2.6.16 by adding database input escaping as shown in commit 92b6eea.

## Affected products

- Emlog CMS Pro prior to 2.6.16

## Timeline

- 2026-09-04: disclosed
- 2026-06-04: patched: version 2.6.16 released with fix

## References

- [https://github.com/emlog/emlog/commit/92b6eea618891b28ed0c520564dff26e170645b4](https://github.com/emlog/emlog/commit/92b6eea618891b28ed0c520564dff26e170645b4)
- [https://github.com/emlog/emlog/releases/tag/pro-2.6.16](https://github.com/emlog/emlog/releases/tag/pro-2.6.16)