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7.5
Pretix Exposes Sensitive System Information in Emails
CVE-2026-2452
Summary
Pretix email templates can leak sensitive system info to attackers. Anyone with access to the backend can create malicious email templates that reveal database passwords and API keys. To stay safe, update your Pretix config file and change all passwords and API keys.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| pretix | pretix | > 4.16.0 , <= 2026.1.1 | – |
| pretix | newsletters | <= 1.6.3 | – |
| pretix | newsletters | 2.0.0 | – |
Original title
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 fi...
Original 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.
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.
nvd CVSS3.1
6.5
nvd CVSS4.0
7.5
Vulnerability type
CWE-627
- https://pretix.eu/about/en/blog/20260216-release-2026-1-1/ Patch Third Party Advisory
Published: 16 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026