Published: 19/10/2020 Updated: 26/10/2020

CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 6.1 | Impact Score: 2.7 | Exploitability Score: 2.8

VMScore: 383

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

AuthRestServlet in Matrix Synapse prior to 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote malicious user to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the /_matrix/client/r0/auth/*/fallback/web or /_matrix/client/unstable/auth/*/fallback/web Synapse endpoints.

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matrix synapse

Severity Unknown Remote Unknown Type Unknown Description AVG-1252 matrix-synapse 1210-1 Unknown Vulnerable ...

CWE-79 https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory https://github.com/matrix-org/synapse/pull/8444 https://github.com/matrix-org/synapse/releases/tag/v1.21.2 https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq https://nvd.nist.gov https://security.archlinux.org/CVE-2020-26891

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CVE-2020-26891

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