{"cve":"CVE-2019-11340","nvd":{"published":"2019-04-19T14:29:00.417","modified":"2026-06-17T02:12:44.423","status":"Modified","description":"util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled. This occurs because of potentially unwanted behavior in Python, in which an email.utils.parseaddr call on user@bad.example.net@good.example.com returns the user@bad.example.net substring.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9},"cwes":["CWE-20"],"references":["https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc","https://github.com/matrix-org/sydent/compare/7c002cd...09278fb","https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/","https://twitter.com/matrixdotorg/status/1118934335963500545","https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc"],"products":["matrix:sydent"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-11340","score":0.01876,"percentile":0.79411,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q9h8-gpw5-c95c","url":"https://osv.dev/vulnerability/GHSA-q9h8-gpw5-c95c","summary":"Matrix Sydent mishandles emails","modified":"2026-07-07T11:56:08.554826852Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<1.0.2"],"fixed":["1.0.2"]}]},{"id":"PYSEC-2026-843","url":"https://osv.dev/vulnerability/PYSEC-2026-843","summary":"Matrix Sydent mishandles emails","modified":"2026-07-07T11:46:05.809734259Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<1.0.2"],"fixed":["1.0.2"]}]}],"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."]}