CVE-2021-21238: Improper Verification of Cryptographic Signature
(updated )
PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2
References
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