CVE WatchAug 19, 2026

CVE-2026-49289

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the library permits attacker-control

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

0-100

Published: Aug 19, 2026 · Last modified: Aug 19, 2026 · CWE-400

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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