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Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package matrix-synapse  (opens in a new tab)

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EPSS
1.22% (65th percentile)

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  • Snyk IDSNYK-DEBIAN11-MATRIXSYNAPSE-1089412
  • published27 Mar 2021
  • disclosed26 Mar 2021
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Introduced: 26 Mar 2021

CVE-2021-21332  (opens in a new tab)
CWE-79  (opens in a new tab)

Amendment

The Debian security team deemed this advisory irrelevant for Debian:11.

NVD Description

Note: Versions mentioned in the description apply only to the upstream matrix-synapse package and not the matrix-synapse package as distributed by Debian.

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 password reset endpoint served via Synapse was vulnerable to cross-site scripting (XSS) attacks. The impact depends on the configuration of the domain that Synapse is deployed on, but may allow access to cookies and other browser data, CSRF vulnerabilities, and access to other resources served on the same domain or parent domains. This is fixed in version 1.27.0.