Bug 2548802 (CVE-2026-96222)

Summary:	CVE-2026-96222 dotnet8.0: Active Directory Federation Services (AD FS) Spoofing Vulnerability
Product:	[Other] Security Response	Reporter:	Charles Timko <ctimko>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, security-response-team, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2553823
Bug Blocks:
Deadline:	2026-10-13

Description Charles Timko 2026-10-09 19:42:20 UTC

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Affected packages:
- System.Security.Cryptography.Xml (release 8.0): 8.0.0 - 8.0.4; fixed 8.0.5

Comment 1 Jon Orris 2026-10-20 21:36:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:86168 https://access.redhat.com/errata/RHSA-2026:86168

Comment 2 Jon Orris 2026-10-20 22:46:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:86169 https://access.redhat.com/errata/RHSA-2026:86169

Comment 3 Jon Orris 2026-10-21 03:42:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:86594 https://access.redhat.com/errata/RHSA-2026:86594