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CVE-2026-49283: SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass

high Affects simplesamlphp/saml2, simplesamlphp/saml2-legacy. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass

Package
simplesamlphp/saml2 Composer
Affected versions
>=6.0.0 and <6.2.1 or >=5.0.0 and <5.0.6 or >=4.20.0 and <4.20.2 or <4.19.3
Fixed in
6.2.1, 5.0.6, 4.20.2, 4.19.3
Severity
high  CVSS 8.7
Exploitation
not on CISA KEV · EPSS 0% (40.7th percentile)
Published
2026-07-02
Source
osv.dev

References

SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass

Package
simplesamlphp/saml2-legacy Composer
Affected versions
>=4.20.0 and <4.20.2 or <4.19.3
Fixed in
4.20.2, 4.19.3
Severity
high  CVSS 8.7
Exploitation
not on CISA KEV · EPSS 0% (40.7th percentile)
Published
2026-07-02
Source
osv.dev

References

CWE-295
NVD recordsimplesamlphp/saml2 advisoriessimplesamlphp/saml2-legacy advisories

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