CVE-2019-11340

Name: CVE-2019-11340
Creator: NVD / NIST
Published: 2019-04-19T14:29:00.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.86%

Last modified Jun 17, 2026

CVE-2019-11340 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.86%

76.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Matrix	Sydent	< 1.0.2

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

Timeline

Published: Apr 19, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11340?

How severe is CVE-2019-11340?

Severity scoring for CVE-2019-11340 is pending analysis. The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11340?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11340?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST