Jetty suffers from a vulnerability where certain encoded URIs and ambiguous paths can access protected files in the WEB-INF folder. Versions effected are: 9.4.37.v20210219, 9.4.38.v20210224 and 9.4.37-9.4.42, 10.0.1-10.0.5, 11.0.1-11.0.5. Exploitation can obtain any file in the WEB-INF folder, but web.xml is most likely to have information of value.
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