{"id":"GHSA-mh74-4m5g-fcjx","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.","aliases":["CVE-2021-29432","PYSEC-2021-23"],"modified":"2026-05-07T05:00:58.518369611Z","published":"2021-04-19T14:54:24Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2021-04-15T20:47:15Z","nvd_published_at":"2021-04-15T21:15:00Z","cwe_ids":["CWE-20"]},"references":[{"type":"WEB","url":"https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29432"},{"type":"WEB","url":"https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42"},{"type":"WEB","url":"https://github.com/matrix-org/sydent/releases/tag/v2.3.0"},{"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"}],"affected":[{"package":{"name":"matrix-sydent","ecosystem":"PyPI","purl":"pkg:pypi/matrix-sydent"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0"}]}],"versions":["2.0.0","2.0.1","2.1.0","2.2.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-mh74-4m5g-fcjx/GHSA-mh74-4m5g-fcjx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}