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CVE-2026-41426

CVE-2026-41426 · pretalx: Email injection via unescaped user-controlled placeholders in pretalx mail templates

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.1 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • pretalx

    Versions
    • < 2026.1.0: Affected

    No fix published

  • pretalx PyPI

    Versions
    • 0.1.0
    • 0.2.0.post1
    • 0.2.1.post1
    • 0.2.2
    • 0.3.0
    • 0.3.1
    • 0.4.0
    • 0.4.1
    • 0.5.0
    • 0.6.0
    • 0.6.1
    • 0.7.0
    • 0.7.1
    • 0.8.0
    • 0.9.0
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.1.0
    • 1.1.1
    • 1.1.2
    • 2.0.0
    • 2.1.0
    • 2.1.1
    • 2.2.0
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2023.1.0
    • 2023.1.1
    • 2023.1.2
    • 2023.1.3
    • 2024.1.0
    • 2024.2.0
    • 2024.2.1
    • 2024.3.0
    • 2024.3.1
    • 2025.1.0
    • 2025.2.0
    • 2025.2.1
    • 2025.2.2
    Affected ranges
    • ECOSYSTEM: < 2026.1.0

    Update to 2026.1.0

Original sources

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