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Introduction In this blog post, we will analyze CVE-2024-45409, a critical vulnerability impacting Ruby-SAML, OmniAuth-SAML libraries, which effectively affects GitLab. This vulnerability allows an attacker to bypass SAML authentication mechanisms and gain unauthorized access by exploiting a flaw in how SAML responses are handled. The issue arises due to weaknesses in the verification of the digital signature used to protect SAML assertions, allowing attackers to manipulate the SAML response a