CVE-2020-5261

HIGH

Sustainsys.Saml2 >2.0.0 <2.5.0 - Privilege Escalation

Title source: llm

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.

References (3)

Scores

CVSS v3 8.2
EPSS 0.0029
EPSS Percentile 51.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Classification

CWE
CWE-294
Status published

Affected Products (2)

sustainsys/saml2 < 2.5.0
nuget/Sustainsys.Saml2 < 2.5.0NuGet

Timeline

Published Mar 25, 2020
Tracked Since Feb 18, 2026