ALT-PU-2020-3036-1
Package matrix-synapse updated to version 1.21.0-alt1 for branch sisyphus in task 259805.
Closed vulnerabilities
Published: 2020-10-19
Modified: 2024-11-21
Modified: 2024-11-21
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 /_matrix/client/r0/auth/*/fallback/web or /_matrix/client/unstable/auth/*/fallback/web Synapse endpoints.
Severity: MEDIUM (6.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References:
- https://github.com/matrix-org/synapse/pull/8444
- 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/releases/tag/v1.21.2
- https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq
- https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq
- https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory
- https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory