CVE-2026-41426Network attack vector

Unauthenticated phishing via unescaped mail placeholders

Published Apr 24, 2026 · Updated Apr 24, 2026

Email injection in pretalx before 2026.1.0 allows remote attackers to send arbitrary HTML-rendered phishing email from trusted event senders. Mail templates interpolate user-controlled placeholders, including account display names, without escaping malformed HTML or markdown link syntax. No authentication is required: an attacker can register a malicious display name, target a victim in the password-reset flow, and produce mail that passes SPF, DKIM, and DMARC checks.

CVSS severity6.1
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Email injection in pretalx before 2026.1.0 allows remote attackers to send arbitrary HTML-rendered phishing email from trusted event senders. Mail templates interpolate user-controlled placeholders, including account display names, without escaping malformed HTML or markdown link syntax. No authentication is required: an attacker can register a malicious display name, target a victim in the password-reset flow, and produce mail that passes SPF, DKIM, and DMARC checks.

The record

CVE
CVE-2026-41426
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
pretalx
Product
pretalx
Classifications
CWE-116, CWE-79, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pretalx · pretalxversion=< 2026.1.0

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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