CVE-2026-2452

Technical 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.

Remediation

Check the references section for vendor advisories and patches from pretix. Update newsletters to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References