CVE-2017-18122 is a high-severity security vulnerability in simplesamlphp/simplesamlphp (composer), affecting versions < 1.14.17. It is fixed in 1.14.17.
A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.
CVE-2017-18122 has a CVSS score of 8.1 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (1.14.17). Upgrading removes the vulnerable code path.
composer
simplesamlphp/simplesamlphp (< 1.14.17)simplesamlphp/simplesamlphp → 1.14.17 (composer)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2017-18122 is reachable in your applications. Explore open-source security for your team.
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Already deployed Kodem? See CVE-2017-18122 in your environment →Upgrade simplesamlphp/simplesamlphp to 1.14.17 or later to resolve this vulnerability.
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CVE-2017-18122 is a high-severity security vulnerability in simplesamlphp/simplesamlphp (composer), affecting versions < 1.14.17. It is fixed in 1.14.17.
CVE-2017-18122 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
simplesamlphp/simplesamlphp (composer) versions < 1.14.17 is affected.
Yes. CVE-2017-18122 is fixed in 1.14.17. Upgrade to this version or later.
Whether CVE-2017-18122 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade simplesamlphp/simplesamlphp to 1.14.17 or later.