Design/Logic Flaw

AuthRestServlet in Matrix Synapse before 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote attacker to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the...

PYSEC-2020-238

AuthRestServlet in Matrix Synapse before 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote attacker to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the...

UBUNTU-CVE-2020-26891

AuthRestServlet in Matrix Synapse before 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote attacker to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the...

CVE-2020-26891

CVE-2020-26891 affects Matrix Synapse prior to version 1.21.0. The vulnerability is an XSS flaw in AuthRestServlet caused by unsafe interpolation of the session GET parameter, which could allow an attacker to craft a malicious URL that triggers script execution on the Synapse-hosted domain via en...