{"id":"CVE-2026-41426","aliases":["GHSA-jm8c-9f3j-4378","PYSEC-2026-109"],"url":"https://o3.security/vulnerability/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.","published":"2026-04-24T19:15:39.205Z","modified":"2026-07-15T01:49:10.677323499Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pretalx","fixedVersion":"2026.1.0"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:10.677323499Z"}}