What’s Vulnerable › Vulnerabilities
CVE-2026-2452: Unsafe variable evaluation in email templates
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-16 · updated 2026-06-17
- Weakness: CWE-627
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.
Affected products
- pretix Newsletters: before 1.6.3; 2.0.0 — fixed in 1.6.3
- pretix: from 4.16.0 before 2026.1.1 — fixed in 2026.1.1
How to fix
Upgrade to a fixed version: pretix Newsletters 1.6.3; pretix 2026.1.1. Check the vendor advisory for mitigations.
References
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