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CVE-2026-49284 SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`

🗓️ 17 Jul 2026 19:17:23Reported by GoogleType 
osv
 osv🔗 osv.dev👁 2 Views

SimpleSAMLphp SP may accept responses from an unexpected IdP; disclosure fixed in later versions.

Related
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-49284
17 Jul 202619:17
–attackerkb
Circl		CVE-2026-49284
17 Jul 202619:50
–circl
CVE		CVE-2026-49284
17 Jul 202619:17
–cve
Cvelist		CVE-2026-49284 SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
17 Jul 202619:17
–cvelist
EUVD		EUVD-2026-45284
17 Jul 202619:17
–euvd
Github Security Blog		SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
2 Jul 202620:47
–github
NVD		CVE-2026-49284
17 Jul 202620:17
–nvd
OSV		GHSA-Q8R6-XJ3F-WRRM SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
2 Jul 202620:47
–osv
Positive Technologies		PT-2026-55453
2 Jul 202600:00
–ptsecurity
Snyk		Insufficient Verification of Data Authenticity
2 Jul 202620:47
–snyk
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18 Jul 2026 03:47Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.17.1
information disclosureidentity providerunsigned responsesubject confirmation data
2