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CVE-2025-27773: The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding

high Affects simplesamlphp/saml2, simplesamlphp/saml2-legacy. Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding

Package
simplesamlphp/saml2 Composer
Affected versions
<4.17.0 or >=5.0.0-alpha.1 and <5.0.0-alpha.20
Fixed in
4.17.0, 5.0.0-alpha.20
Severity
high  CVSS 8.6
Exploitation
not on CISA KEV · EPSS 0% (35.7th percentile)
Published
2025-03-11
Source
osv.dev

References

The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding

Package
simplesamlphp/saml2-legacy Composer
Affected versions
<4.17.0
Fixed in
4.17.0
Severity
high  CVSS 8.6
Exploitation
not on CISA KEV · EPSS 0% (35.7th percentile)
Published
2025-03-11
Source
osv.dev

References

CWE-347
NVD recordsimplesamlphp/saml2 advisoriessimplesamlphp/saml2-legacy advisories

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