Medium severity6.5NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026
CVE-2021-27736
CVE-2021-27736
Description
FusionAuth fusionauth-samlv2 before 0.5.4 allows XXE attacks via a forged AuthnRequest or LogoutRequest because parseFromBytes uses javax.xml.parsers.DocumentBuilderFactory unsafely.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- FusionAuth/fusionauth-samlv2description
- Range: <0.5.4
Patches
Vulnerability mechanics
References
3- github.com/FusionAuth/fusionauth-samlv2/commit/c66fb689d50010662f705d5b585c6388ce555dbdnvdPatchThird Party Advisory
- github.com/FusionAuth/fusionauth-samlv2/compare/0.5.3...0.5.4nvdPatchThird Party Advisory
- www.compass-security.com/fileadmin/Research/Advisories/2021-03_CSNC-2021-004_FusionAuth_SAML_Library_XML_External_Entity.txtnvdExploitThird Party Advisory
News mentions
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