CVE-2019-11340
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.
Does this matter?
Lower severity and a low EPSS score (1.88%). Track it; it rarely justifies an emergency change on its own.
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 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.88% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- matrix/sydent
- Source
- cve@mitre.org
EPSS 1.9% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch, Third Party Advisory
- https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch, Third Party Advisory
- https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes, Vendor Advisory
- https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory
- https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch, Third Party Advisory
- https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch, Third Party Advisory
- https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes, Vendor Advisory
- https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.