Malicious users could abuse Sydent to control the content of invitation emails
Impact
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.
Patches
Fixed in 4469d1d, 6b405a8, 65a6e91.
Note that these patches include changes to the default email templates. If these templates have been locally modified, they must also be updated.
For more information
If you have any questions or comments about this advisory, email us at security@matrix.org.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | matrix-sydent | < 2.3.0 | 2.3.0 |
References
- https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx
- https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42
- https://pypi.org/project/matrix-sydent/
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0
- https://nvd.nist.gov/vuln/detail/CVE-2021-29432
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-23.yaml
- https://pypi.org/project/matrix-sydent
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-20- Platform
- Python (PyPI)
- Package
matrix-sydent- Disclosed
- 15.04.2021
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2021-23 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-mh74-4m5g-fcjx - CC BY 4.0
Vulnerability history: matrix-sydent
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 05.2019 07.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 4
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 4
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
-
Malicious users could abuse Sydent to control the content of invitation emails this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.