Quick answers
- Is CVE-2026-33734 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-33734 being exploited in the wild.
- How severe is CVE-2026-33734?
- Informational severity, with a CVSS score of 6.9, published 6 July 2026.
- Which products and versions are affected?
- FOSSBilling 0.6.0 - 0.7.2.
- Is there a fix for CVE-2026-33734?
- A patch was published on 2026-08-01: Version 0.8.0 released to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-33734 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-33734?
- Check whether you run FOSSBilling 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
A SQL injection vulnerability exists in the `Massmailer` module of FOSSBilling due to improper neutralization of user-supplied filters. In `src/modules/Massmailer/Service.php`, the `getMessageReceivers` function uses `sprintf` and `implode` to interpolate JSON-decoded filter values directly into a SQL query without parameterization. An authenticated attacker with administrator privileges can submit a crafted `message_update` API request containing SQL payloads in fields like `client_status`. When the administrator subsequently triggers a recipient preview or sends the message, the payload executes, allowing for full data exfiltration from the database. The issue is resolved in version 0.8.0.
Affected products
- FOSSBilling FOSSBilling 0.6.0 - 0.7.2
Timeline
- 2026-06-12: advisory: GitHub security advisory published
- 2026-07-06: disclosed: CVE published to NVD
- 2026-08-01: patched: Version 0.8.0 released to address the vulnerability