CVE-2021-27736
MEDIUMFusionAuth fusionauth-samlv2 <0.5.4 - XML External Entity
Title source: llmDescription
FusionAuth fusionauth-samlv2 before 0.5.4 allows XXE attacks via a forged AuthnRequest or LogoutRequest because parseFromBytes uses javax.xml.parsers.DocumentBuilderFactory unsafely.
References (3)
Core 3
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/FusionAuth/fusionauth-samlv2/compare/0.5.3...0.5.4
Patch, Third Party Advisory x_refsource_misc
https://github.com/FusionAuth/fusionauth-samlv2/commit/c66fb689d50010662f705d5b585c6388ce555dbd
Exploit, Third Party Advisory x_refsource_misc
https://www.compass-security.com/fileadmin/Research/Advisories/2021-03_CSNC-2021-004_FusionAuth_SAML_Library_XML_External_Entity.txt
Scores
CVSS v3
6.5
EPSS
0.0028
EPSS Percentile
50.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Details
CWE
CWE-611
Status
published
Products (1)
fusionauth/saml_v2
< 0.5.4
Published
Apr 22, 2021
Tracked Since
Feb 18, 2026