CVE-2021-21332

CVE-2021-21332, GHSA-246w-56m2-5899

pypi/matrix-synapse

Cross-site Scripting

Synapse is a Matrix reference homeserver written in python. Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse, 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.

All versions before 1.27.0

Upgrade to version 1.27.0 or above.

2021-04-02