CVE-2026-41426

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 v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/pretalx/pretalx/security/advisories/GHSA-jm8c-9f3j-4378	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:pretalx:pretalx:*:*:*:*:*:*:*:*

History

28 Apr 2026, 18:17

Type	Values Removed	Values Added
First Time		Pretalx Pretalx pretalx
References	~~() https://github.com/pretalx/pretalx/security/advisories/GHSA-jm8c-9f3j-4378 -~~	() https://github.com/pretalx/pretalx/security/advisories/GHSA-jm8c-9f3j-4378 - Vendor Advisory
CPE		cpe:2.3:a:pretalx:pretalx::::::::

24 Apr 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-24 20:16

Updated : 2026-06-17 10:46

NVD link : CVE-2026-41426

Mitre link : CVE-2026-41426

CVE.ORG link : CVE-2026-41426

JSON object : View

Products Affected

pretalx

pretalx

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-116

Improper Encoding or Escaping of Output

{"id": "CVE-2026-41426", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41426", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-25T01:50:24.719547Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "pretalx", "product": "pretalx", "versions": [{"status": "affected", "version": "< 2026.1.0"}]}]}], "published": "2026-04-24T20:16:27.247", "references": [{"url": "https://github.com/pretalx/pretalx/security/advisories/GHSA-jm8c-9f3j-4378", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-116"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-06-17T10:46:42.490", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:pretalx:pretalx:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "03EB5005-B230-44D1-ABC5-16C13DC4D187", "versionEndExcluding": "2026.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}