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    CVE-2025-27773

    The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.

    Published:Mar 11, 2025
    Last Modified:Apr 15, 2026
    EPS:Mar 11, 2025
    EPSS Score:0.00217
    CVSS Score:8.6

    Affected Products

    Vendor
    Simplesamlphp
    Product
    Saml2

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-49289 (CVSS 7.5) — The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the li…
    CVE-2026-49283 (CVSS 8.7) — The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.…
    CVE-2024-52806 (CVSS 8.3) — SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. When loading an (untrusted) XML …
    CVE-2023-49087 (CVSS 6.8) — xml-security is a library that implements XML signatures and encryption. Validation of an XML signature requir…
    CVE-2018-7711 (CVSS 8.1) — HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values i…
    CVE-2018-6519 (CVSS 7.5) — The SAML2 library before 1.10.4, 2.x before 2.3.5, and 3.x before 3.1.1 in SimpleSAMLphp has a Regular Express…
    CVE-2016-9814 (CVSS 9.1) — The validateSignature method in the SAML2\Utils class in SimpleSAMLphp before 1.14.10 and simplesamlphp/saml2 …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High