Safety vulnerability ID: 40107
The information on this page was manually curated by our Cybersecurity Intelligence Team.
Matrix-synapse 1.27.0 includes a fix for CVE-2021-21333: 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.
Latest version: 1.121.1
Homeserver for the Matrix decentralised comms protocol
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. See CVE-2021-21333.
CONFIRM:https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm: https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm
MISC:https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df: https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
MISC:https://github.com/matrix-org/synapse/pull/9200: https://github.com/matrix-org/synapse/pull/9200
MISC:https://github.com/matrix-org/synapse/releases/tag/v1.27.0: https://github.com/matrix-org/synapse/releases/tag/v1.27.0
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