Published: 26/03/2021 Updated: 07/11/2023

CVSS v2 Base Score: 2.6 | Impact Score: 2.9 | Exploitability Score: 4.9

CVSS v3 Base Score: 6.1 | Impact Score: 4 | Exploitability Score: 1.6

VMScore: 231

Vector: AV:N/AC:H/Au:N/C:N/I:P/A:N

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 malicious user 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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matrix synapse
fedoraproject fedora 34

CWE-79 https://github.com/matrix-org/synapse/pull/9200 https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df https://github.com/matrix-org/synapse/releases/tag/v1.27.0 https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/https://nvd.nist.gov

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CVE-2021-21333

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