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.
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cve-icon MITRE Information

Status: PUBLISHED

Assigner: GitHub_M

Published: 2021-03-26T20:00:19

Updated: 2021-08-02T02:06:36

Reserved: 2020-12-22T00:00:00


Link: CVE-2021-21333

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2021-03-26T20:15:11.953

Modified: 2023-11-07T03:29:49.350


Link: CVE-2021-21333

JSON object: View

cve-icon Redhat Information

No data.