pretix pretix-newsletter up to 1.x/2.0.0 Placeholder dynamic variable evaluation

Summaryinfo

A vulnerability identified as problematic has been detected in pretix pretix-newsletter up to 1.x/2.0.0. The affected element is an unknown function of the component Placeholder Handler. The manipulation leads to dynamic variable evaluation. This vulnerability is uniquely identified as CVE-2026-2452. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in pretix pretix-newsletter up to 1.x/2.0.0. This issue affects some unknown functionality of the component Placeholder Handler. The manipulation with an unknown input leads to a dynamic variable evaluation vulnerability. Using CWE to declare the problem leads to CWE-627. In a language where the user can influence the name of a variable at runtime, if the variable names are not controlled, an attacker can read or write to arbitrary variables, or access arbitrary functions. Impacted is confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at pretix.eu. The identification of this vulnerability is CVE-2026-2452 since 02/13/2026. The exploitation is known to be difficult. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.0.0 or 2.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-6095). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• pretix

Name

• pretix-newsletter

Version

• 1.x
• 2.0

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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