CVE-2026-49289High· 7.5▾ TwilightThe SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the library permits attacker-controlled XPath transforms while processing XML signatures in specially crafted SAML messages. XPath ev…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.6%
Last analysed / modified upstream
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the library permits attacker-controlled XPath transforms while processing XML signatures in specially crafted SAML messages. XPath evaluation can consume uncontrolled processing resources, allowing a remote unauthenticated attacker to deny service to any entity relying on SimpleSAMLphp or directly on the SAML2 library. The mitigation limits the number of transforms, permits only transform algorithms identified by the SAML 2.0 Core specification, and specifically rejects XPath transforms. This issue is fixed in versions 4.19.3 and 4.20.3.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
simplesamlphp/saml2 <= 4.20.2simplesamlphp/saml2-legacy <= 4.20.2Patched in:
simplesamlphp/saml2 4.20.3simplesamlphp/saml2-legacy 4.20.3Connected by shared product, vendor, weakness, or advisory.
CVE-2026-49283High· 8.7The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality
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