CVE-2021-21333

Injection Vulnerability in pypi/matrix-synapse

Identifier

CVE-2021-21333

Package Slug

pypi/matrix-synapse

Vulnerability

Injection Vulnerability

Description

Synapse is a Matrix reference homeserver written in python. Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse, 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.

Affected Versions

All versions before 1.27.0

Solution

Upgrade to version 1.27.0 or above.

Last Modified

2021-04-02

source