FOSSBilling up to 0.7.x Massmailer sql injection

Summaryinfo

A vulnerability marked as problematic has been reported in FOSSBilling up to 0.7.x. Affected by this vulnerability is an unknown functionality of the component Massmailer. The manipulation leads to sql injection. This vulnerability is documented as CVE-2026-33734. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in FOSSBilling up to 0.7.x. It has been rated as problematic. This issue affects an unknown code of the component Massmailer. The manipulation with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FOSSBilling is a free, open-source billing and client management system. Versions 0.6.0 through 0.7.2 have a SQL injection vulnerability in the `Massmailer` module filter functionality. An authenticated administrator can supply crafted filter values when updating a mass email message, causing untrusted input to be interpolated directly into SQL in the recipient selection query. Version 0.8.0 patches the issue. Some workarounds are available. Restrict administrator access to trusted users only, disable the `Massmailer` module if it is not required, audit existing records in the `mod_massmailer` table for suspicious filter values, and/or review administrator activity related to `Massmailer` message updates.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-33734 since 03/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

Upgrading to version 0.8.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-41945). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Billing Software

Name

• FOSSBilling

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7

Website

• Product: https://github.com/FOSSBilling/FOSSBilling/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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