Vulnerability Description
Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name} is used in an email template, it will be replaced with the buyer's name for the final email. This mechanism contained a security-relevant bug: It was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.__init__.__code__.co_filename}}. This way, an attacker with the ability to control email templates (usually every user of the pretix backend) could retrieve sensitive information from the system configuration, including even database passwords or API keys. pretix does include mechanisms to prevent the usage of such malicious placeholders, however due to a mistake in the code, they were not fully effective for this plugin. Out of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg https://docs.pretix.eu/self-hosting/config/ file.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pretix | Newsletters | < 1.6.3 |
| Pretix | Pretix | >= 4.16.0, < 2026.1.1 |
Related Weaknesses (CWE)
References
- https://pretix.eu/about/en/blog/20260216-release-2026-1-1/PatchThird Party Advisory
FAQ
What is CVE-2026-2452?
CVE-2026-2452 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name} is used in an email template, it will be replaced with the buyer's name for the final...
How severe is CVE-2026-2452?
CVE-2026-2452 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-2452?
Check the references section above for vendor advisories and patch information. Affected products include: Pretix Newsletters, Pretix Pretix.