CVE-2020-12676 — FusionAuth fusionauth-samlv2 0

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".

01What is this vulnerability?

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".

02Affected products

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

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-10-02T19:40:33.000Z
• Last modified: 2024-08-04T12:04:22.514Z

09References

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