{"cve":"CVE-2021-29432","nvd":{"published":"2021-04-15T21:15:17.630","modified":"2026-06-17T03:47:37.827","status":"Modified","description":"Sydent is a reference matrix identity server. A 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. This issue has been fixed in 4469d1d.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N","score":5.7},"cwes":["CWE-20"],"references":["https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42","https://github.com/matrix-org/sydent/releases/tag/v2.3.0","https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx","https://pypi.org/project/matrix-sydent/","https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42"],"products":["matrix:sydent"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-29432","score":0.00934,"percentile":0.60751,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mh74-4m5g-fcjx","url":"https://osv.dev/vulnerability/GHSA-mh74-4m5g-fcjx","summary":"Malicious users could abuse Sydent to control the content of invitation emails","modified":"2026-09-10T03:49:03.750948873Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<2.3.0"],"fixed":["2.3.0"]}]},{"id":"PYSEC-2021-23","url":"https://osv.dev/vulnerability/PYSEC-2021-23","summary":"","modified":"2023-11-08T04:05:33.772633Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<2.3.0"],"fixed":["2.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}