This security update resolves an Authentication Bypass vulnerability that allows SAML tokens to be signed by using arbitrary symmetric keys in Windows Communication Foundation (WCF) and Windows Identity Foundation (WIF). To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1006 and Microsoft Common Vulnerabilities and Exposures CVE-2019-1134.
Note To apply this security update, you must have the release version of Service Pack 1 for Microsoft SharePoint Server 2013 installed on the computer.
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