What’s Vulnerable › Vulnerabilities

CVE-2020-12676

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-02 · updated 2026-06-17
• Weakness: CWE-347

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".

Affected products

• Fusionauth Samlv2: 0.2.3

References

• http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.html
• http://seclists.org/fulldisclosure/2020/Oct/1
• https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txt
• https://github.com/SAMLRaider/SAMLRaider
• https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdf
• http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.html
• http://seclists.org/fulldisclosure/2020/Oct/1
• https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txt
• https://github.com/SAMLRaider/SAMLRaider
• https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdf

Get alerted when CVE-2020-12676 or the next vulnerability affects your stack