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CVE-2020-5261 Details

Description

Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 is not affected. It has a correct Token Replay Implementation and is safe to use. Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 have a faulty implementation of Token Replay Detection. Token Replay Detection is an important defense measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 and prior versions are not affected. These versions have a correct Token Replay Implementation and are safe to use.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241	CVE	PatchThird Party Advisory
https://github.com/Sustainsys/Saml2/issues/711	CVE	Issue TrackingThird Party Advisory
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv	CVE	Third Party Advisory
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241	[email protected]	PatchThird Party Advisory
https://github.com/Sustainsys/Saml2/issues/711	[email protected]	Issue TrackingThird Party Advisory
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv	[email protected]	Third Party Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-294	Authentication Bypass by Capture-replay	[email protected]
CWE-294	Authentication Bypass by Capture-replay	[email protected]

Affected Products

Product	Versions
sustainsys saml2	>= 2.0.0, < 2.5.0
CPE cpe:2.3:a:sustainsys:saml2:::::::: Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Mar 24, 2021	Reanalysis	[email protected]
Mar 27, 2020	Initial Analysis	[email protected]
Mar 25, 2020	CVE Modified	[email protected]