util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions…
Priority LOW 30CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
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 [email protected]@good.example.com returns the [email protected] substring.
Why it matters now
EPSS 0.01876 79th percentileScored 2026-11-07
Fix Fixed matrix-sydent (PyPI): 1.0.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | matrix-sydent (PyPI) | before 1.0.2 | 1.0.2 | Patch available | GHSA-q9h8-gpw5-c95c |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- matrix-sydent (PyPI) Vendor— Affected before 1.0.2 Fixed in 1.0.2 Patch available GHSA-q9h8-gpw5-c95c
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:* | before 1.0.2 | Vulnerable | matrix-org |
- cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:* Versions before 1.0.2 Vulnerable ·matrix-org
Remediation
- Fix · GHSA-q9h8-gpw5-c95c matrix-sydent (PyPI) Fixed in 1.0.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-11340
- 2026-10-03 Alias added: GHSA-q9h8-gpw5-c95c
References
Patch 2
Advisory 3
More matrix-org Sydent vulnerabilities
- TI-2023-20035 Sydent does not verify email server certificates CVSS 3.1CRITICAL 9.3
- TI-2021-10144 SSRF in Sydent due to missing validation of hostnames CVSS 3.1HIGH 7.7
- TI-2021-10143 Denial of service attack via memory exhaustion CVSS 3.1HIGH 7.5
- TI-2019-08878 An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. CVSS 3.0HIGH 7.5
- TI-2021-10145 Malicious users could control the content of invitation emails CVSS 3.1MEDIUM 5.7
- TI-2021-10146 Denial of service (via resource exhaustion) due to improper input validation CVSS 3.1MEDIUM 4.3
Sources
- CVE-2019-11340 · CVE Program
- CVE-2019-11340 · NVD
- FIRST EPSS
- GHSA-q9h8-gpw5-c95c · GitHub Advisory Database · CC BY 4.0
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