CVE-2026-2452: 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…

PriorityP340medium6.5CVSS 3.1

AVNACLPRLUINSUCHINAN

EPSS

0.26%

17.0th percentile

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

5 ranges

Vendor	Product	Version range	Fixed in
pretix	newsletters	< 1.6.3	1.6.3
pretix	newsletters	—	—
pretix	pretix	>= 4.16.0 < 2026.1.1	2026.1.1
pretix	pretix-newsletter	>= 1.0.0 < 2.0.0	2.0.0
pretix	pretix-newsletter	>= 2.0.0 < 2.0.1	2.0.1

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvdv4.07.5HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:L/U:Red

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