{"id":"CVE-2021-29432","aliases":["GHSA-mh74-4m5g-fcjx","PYSEC-2021-23"],"url":"https://o3.security/vulnerability/CVE-2021-29432","summary":"Malicious users could abuse Sydent to control the content of invitation emails","details":"### Impact\n\nA malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example.\n\n### Patches\n\nFixed in 4469d1d, 6b405a8, 65a6e91.\n\nNote that these patches include changes to the *default* email templates. If these templates have been locally modified, they must also be updated.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at security@matrix.org.","published":"2021-04-15T21:15:17.630Z","modified":"2026-10-20T10:53:42.611462159Z","cvss":{"score":5.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"matrix-sydent","fixedVersion":"2.3.0"}],"fix":{"url":"https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42","label":"matrix-org/sydent@4469d1d"},"references":[{"type":"ADVISORY","url":"https://github.com/matrix-org/sydent/releases/tag/v2.3.0"},{"type":"FIX","url":"https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42"},{"type":"FIX","url":"https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx"},{"type":"PACKAGE","url":"https://pypi.org/project/matrix-sydent/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29432"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-23.yaml"},{"type":"WEB","url":"https://pypi.org/project/matrix-sydent"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:53:42.611462159Z"}}