{"id":"CVE-2026-41426","summary":"pretalx: Email injection via unescaped user-controlled placeholders in pretalx mail templates","details":"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.","aliases":["GHSA-jm8c-9f3j-4378","PYSEC-2026-109"],"modified":"2026-07-08T08:13:14.672859474Z","published":"2026-04-24T19:15:39.205Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-116","CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41426.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41426.json"},{"type":"ADVISORY","url":"https://github.com/pretalx/pretalx/security/advisories/GHSA-jm8c-9f3j-4378"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41426"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pretalx/pretalx","events":[{"introduced":"0"},{"fixed":"4174e45b158d0b19db70e520a021cfd93c352866"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2026.1.0"}],"cpe":"cpe:2.3:a:pretalx:pretalx:*:*:*:*:*:*:*:*","source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["v2025.2.1","v2025.2.0","v2025.1.0","v2024.3.1","v2024.3.0","v2024.2.1","v2024.2.0","v2024.1.0","v2023.1.0","v2.3.1","v2.3.0","v2.2.0","v2.1.1","v2.1.0","v2.0.0","v1.1.0","v1.0.0","v0.9.0","v0.8.0","v0.7.1","v0.7.0","v0.6.1","v0.6.0","v0.5.0","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.2","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41426.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}