GHSA-jm8c-9f3j-4378
Medium · 6.1pretalx mail templates vulnerable to email injection via unescaped user-controlled placeholders
CVSS
6.1
EPSS
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Published
Apr 18, 2026
CISA due date
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The record
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. The same class of bug affects every mail template that interpolates a user-controlled placeholder (speaker name, proposal title, biography, question answers, etc.), including organiser-triggered emails such as acceptance/rejection notifications.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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