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.
Metrics
Affected Vendors & Products
References
History
No history.
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Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2024-08-04T16:03:22.630Z
Reserved: 2020-10-08T00:00:00
Link: CVE-2020-26891
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Status : Modified
Published: 2020-10-19T17:15:13.220
Modified: 2024-11-21T05:20:25.413
Link: CVE-2020-26891
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