What’s Vulnerable › Vulnerabilities
CVE-2026-41426: pretalx: Email injection via unescaped user-controlled placeholders in pretalx mail templates
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-24 · updated 2026-06-17
- Weakness: CWE-79
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.
Affected products
- pretalx: before 2026.1.0 — fixed in 2026.1.0
How to fix
Upgrade to a fixed version: pretalx 2026.1.0. Check the vendor advisory for mitigations.
References
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