CVE-2020-5268

mediumPriorität · verfolgen · 29EPSS 0.011 · 65. PerzentilEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.09% (65th) EPSS
CVSS 4.9 · medium
Is it mine?
6 products
Prüfe deine Angriffsfläche
Who says so?
4 sources
cnnvd · enisa_euvd · nvd · osv

EPSS · bewertet 2026-10-27

In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.

01

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

7.3
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 4.9–7.3

v2.04.9mediumAV:N/AC:M/Au:S/C:P/I:P/A:Nprimary · NVD / NIST USAusnutzbarkeit 6.8 · Auswirkung 4.9
v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nprimary · NVD / NIST USAusnutzbarkeit 2.1 · Auswirkung 5.2
v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:Nsecondary · ENISA EU
v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:Nsecondary · security-advisories@github.comAusnutzbarkeit 1.3 · Auswirkung 4.7
v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:Nsecondary · OSV
v3.16.7mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
02

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-287USprimärCWE-303USCWE-303US
03

betroffene Produkte (6)

Betroffene Produkte und Versionsbereiche.

04

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

  • GHSA-9475-xg6m-j7pwSubject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET2020-04-22ghsa · osvUS

    ### Impact Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a tocken to create a log in session. ### Patches Version 1.0.2 and 2.7.0 are patched. ### Workarounds Ensure that any IdentityProvider trusted by the Sustainsys.Saml2 SP only issues bearer tokens if the audience matches the Sustainsys.Saml2 SP. ### For more information If you have any questions or comments about this advisory: * Comment on #103 * Email us at security@sustainsys.com if you think that there are further security issues.

05

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

06

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvdenisa_euvdnvdosvNVDCVE.orgMITRE
veröffentlicht 2020-04-21geändert 2026-06-17
08

Referenzen (13)

Externe Belege — Patches, Meldungen, Analysen.

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