CVE-2021-21333

Description

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email. The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker. This is fixed in version 1.27.0.

Risk Information

Base Score

6.1

MODERATE

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

EPSS Score

Exploitation Probability

0.385

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2021-21332,CVE-2021-21333 are fixed in Python-matrix-synapse 1.27.0	Windows
Vulnerabilities CVE-2021-21332,CVE-2021-21333 are fixed in Python-matrix-synapse for linux 1.27.0	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234