CVE-2020-12676

CriticalCVSS 9.1/10Last modified Jun 17, 2026

Description

FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a "Signature exclusion attack".

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-347

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/1Exploit, Mailing List, Third Party Advisory
https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txtExploit, Mailing List, Vendor Advisory
https://github.com/SAMLRaider/SAMLRaiderThird Party Advisory
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdfExploit, Third Party Advisory
http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/1Exploit, Mailing List, Third Party Advisory
https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txtExploit, Mailing List, Vendor Advisory
https://github.com/SAMLRaider/SAMLRaiderThird Party Advisory
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdfExploit, Third Party Advisory

Timeline

Published: Oct 2, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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