TI-2026-36471 Aliases CVE-2026-49284 GHSA-q8r6-xj3f-wrrm

Insufficient verification of data authenticity in simplesamlphp

LOW 31CWE-345Published 2026-07-17 · Updated 2026-07-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345.

Summary

SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00222 12th percentileScored 2026-11-07

Fix Fixed simplesamlphp (simplesamlphp): 2.4.7, 2.5.2simplesamlphp/simplesamlphp (Packagist): 2.5.2, 2.4.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
simplesamlphp	simplesamlphp	before 2.4.7; 2.5.0-rc1 to before 2.5.2	2.4.7, 2.5.2	Patch available	CNA
—	simplesamlphp/simplesamlphp (Packagist)	2.5.0 to before 2.5.2	2.5.2	Patch available	GHSA-q8r6-xj3f-wrrm
—	simplesamlphp/simplesamlphp (Packagist)	before 2.4.7	2.4.7	Patch available	GHSA-q8r6-xj3f-wrrm

simplesamlphp Vendorsimplesamlphp Affected before 2.4.7; 2.5.0-rc1 to before 2.5.2 Fixed in 2.4.7, 2.5.2 Patch available CNA
simplesamlphp/simplesamlphp (Packagist) Vendor— Affected 2.5.0 to before 2.5.2 Fixed in 2.5.2 Patch available GHSA-q8r6-xj3f-wrrm
simplesamlphp/simplesamlphp (Packagist) Vendor— Affected before 2.4.7 Fixed in 2.4.7 Patch available GHSA-q8r6-xj3f-wrrm

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:simplesamlphp:simplesamlphp::::::::	before 2.4.7; 2.5.0 to before 2.5.2	Vulnerable	simplesamlphp

cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:* Versions before 2.4.7; 2.5.0 to before 2.5.2 Vulnerable ·simplesamlphp

Remediation

Fix · CNA simplesamlphp (simplesamlphp) Fixed in 2.4.7, 2.5.2
Fix · GHSA-q8r6-xj3f-wrrm simplesamlphp/simplesamlphp (Packagist) Fixed in 2.5.2 Advisory →
Fix · GHSA-q8r6-xj3f-wrrm simplesamlphp/simplesamlphp (Packagist) Fixed in 2.4.7 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-49284
2026-10-03 Alias added: GHSA-q8r6-xj3f-wrrm

References

Advisory 1

https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm

Other 3

TI-2018-04801 The sqlauth module in SimpleSAMLphp before 1.15.2 relies on the MySQL utf8 charset, which… CVSS 3.0CRITICAL 9.8
TI-2017-09530 The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and… CVSS 3.0CRITICAL 9.8
TI-2017-09535 SimpleSAMLphp 1.7.0 through 1.14.10 might allow attackers to obtain sensitive… CVSS 3.0CRITICAL 9.8
TI-2016-07944 The validateSignature method in the SAML2\Utils class in SimpleSAMLphp before 1.14.10 and… CVSS 3.0CRITICAL 9.1
TI-2019-02593 Improper signature verification in Rob Richards XmlSecLibs CVSS 3.1HIGH 8.8
TI-2018-05557 HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect… CVSS 3.0HIGH 8.1

See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences