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GoogleOSV:CVE-2020-26891HistoryOct 19, 2020 - 5:15 p.m.
CVE-2020-26891
2020-10-1917:15:13
Google
osv.dev
8
cve-2020-26891
xss
interpolation
remote attacker
malicious url
synapse software
EPSS
0.002
Percentile
53.0%
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.
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