CVE-2026-41426
pretalx mail templates vulnerable to email injection via unescaped user-controlled placeholders
Impact
pretalx is a conference planning tool. Prior to 2026.1.0, an unauthenticated attacker can send arbitrary HTML-rendered emails from a pretalx instance's configured sender address by embedding malformed HTML or markdown link syntax in a user-controlled template placeholder such as the account display name. The most direct vector is the password-reset flow: the attacker registers an account with a malicious name, enters the victim's email address, and triggers a password reset. The resulting email is delivered from the event's legitimate sender address and passes SPF/DKIM/DMARC validation, making it a ready-made phishing vector. This vulnerability is fixed in 2026.1.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pretalx | < 2026.1.0 | 2026.1.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pretalx | Pretalx | before 2026.1.0 |