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Improper Input Validation Affecting matrix-synapse package, versions [,1.27.0)

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.11% (44th percentile)
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NVD
6.1 medium

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  • Snyk ID SNYK-PYTHON-MATRIXSYNAPSE-1089448
  • published 29 Mar 2021
  • disclosed 26 Mar 2021
  • credit Unknown
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Introduced: 26 Mar 2021

CVE-2021-21333 Open this link in a new tab
CWE-74 Open this link in a new tab

How to fix?

Upgrade matrix-synapse to version 1.27.0 or higher.

Overview

matrix-synapse is an ecosystem for open federated Instant Messaging and VoIP.

Affected versions of this package are vulnerable to Improper Input Validation. HTML injection is possible in notification emails regarding missed messages or expiring account. In the case of notifications for missed messages, an attacker can inject forged content into the email. However, the account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker.

References