CVE-2026-41426
Description
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.
How to fix
- pretalx pretalx2026.1.0 or later
- pretalx2026.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pretalx pretalx | v < 2026.1.0 | 2026.1.0 |
| pretalxPyPI | v < 2026.1.0 | 2026.1.0 |
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