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CVE-2020-26891
Published: Oct 19, 2020
Modified: Aug 4, 2024
PUBLISHED
Description
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.
| Vendor | Product | Versions |
|---|---|---|
n/a | n/a | affected n/a |
References
https://github.com/matrix-org/synapse/pull/8444
x_refsource_MISC
https://github.com/matrix-org/synapse/releases/tag/v1.21.2
x_refsource_MISC
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