CVE-2026-2451 Unsafe variable evaluation in email templates
Attackers with backend access can exfiltrate sensitive system configuration data, including passwords and API keys, via crafted email template placeholders.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-2451?
CVE-2026-2451 is a high-severity vulnerability in pretix-doistep, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 file.
Weakness: CWE-627
Which versions are affected by CVE-2026-2451?
It affects 2 products.
Products include Pretix Double Opt in Step, Pretix Pretix.
How do I fix CVE-2026-2451?
No fix has been published for CVE-2026-2451 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-2451 being exploited?
There is no known exploitation of CVE-2026-2451 in the wild and no public exploit code.
Sources
Also known as GHSA-75mf-97wq-jjpw.