Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2020-5268

19
FAUCET Score

CVE-2020-5268 is a high-severity vulnerability affecting Sustainsys.Saml2 Authentication Services versions before 1.0.2 and between 2.0.0 and 2.6.0. The flaw stems from the library incorrectly treating all incoming SAML2 tokens as bearer tokens, even when other subject confirmation methods are specified. This could allow an attacker to bypass authentication by using a specially crafted SAML2 token to establish a login session. The vulnerability has a CVSS score of 7.3 (High), indicating a network-based attack with low attack complexity, requiring low privileges and user interaction, and leading to high confidentiality and integrity impacts. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.2CPE matchmatch criteria
cpe:2.3:a:sustainsys:saml2:*:*:*:*:*:*:*:*
>= 2.0.0, < 2.7.0CPE matchmatch criteria
cpe:2.3:a:sustainsys:saml2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.3
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.09%
Probability of exploitation in next 30 days
EPSS Percentile
61.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0109 is in the 78th percentile among its peer group of 890 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: Sustainsys.Saml2Fixed in: 1.0.2
nugetpatch availablevia ghsa
Product: Sustainsys.Saml2Fixed in: 2.7.0

Vendor Advisories (1)

nugetGHSA-9475-xg6m-j7pwmedium

Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET

Apr 22, 2020

References

github.com / Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
PatchThird Party Advisory
github.com / Sustainsys/Saml2/issues/712
Third Party Advisory
github.com / Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
MitigationThird Party Advisory
nuget.org / packages/Sustainsys.Saml2
Third Party Advisory