CVE-2020-12676
9.1
CRITICAL · CVSS 3.1 · EPSS 2.9% (pctl 87)
In your normal cycle
Critical by CVSS (9.1), but no sign of active exploitation.
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".
Scoring
| CVSS | 9.1 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| EPSS | 2.91% — more likely to be exploited than 87% of all CVEs |
| Weakness | CWE-347 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-10-02 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| fusionauth | samlv2 |
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
→ the Explorer · watch your stack · NVD