CVE-2026-61979 in SAML SP Single Sign On Plugin
Summary
by MITRE • 08/13/2026
Unauthenticated Privilege Escalation in SAML SP Single Sign On <= 5.4.3 versions.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical security flaw in SAML Service Provider single sign-on implementations affecting versions up to 5.4.3. The issue stems from insufficient authentication checks within the SAML assertion processing mechanism, allowing unauthenticated users to manipulate session states and gain elevated privileges within the affected systems. The vulnerability manifests when the service provider fails to properly validate the authenticity of SAML assertions received from identity providers, creating a pathway for malicious actors to craft forged assertions that bypass normal authentication procedures. This weakness directly maps to CWE-287 which addresses improper authentication scenarios in software applications, particularly those involving federated identity management systems. The vulnerability enables attackers to escalate their privileges without proper credentials by exploiting the trust relationship between the SAML service provider and identity provider.
The technical exploitation occurs when an attacker crafts a malicious SAML assertion that contains elevated role claims or permissions, which the vulnerable service provider incorrectly accepts as legitimate due to inadequate signature validation or assertion integrity checks. This flaw specifically impacts the SAML assertion consumption process where the service provider should verify the digital signature of assertions before processing them, but fails to perform this critical validation step in affected versions. The vulnerability creates a persistent access vector that can be exploited across multiple sessions and user contexts, as the forged assertions can maintain their validity within the service provider's session management system. This type of privilege escalation attack aligns with ATT&CK technique T1078 which covers valid accounts usage and credential manipulation in enterprise environments.
The operational impact of this vulnerability extends beyond simple unauthorized access to include potential data breaches, system compromise, and lateral movement within affected networks. Organizations utilizing vulnerable SAML implementations face significant risk as attackers can gain administrative or elevated user privileges without detection, potentially leading to complete system takeover. The vulnerability affects organizations that rely on SAML-based identity federation for cloud services, enterprise applications, and web portals where single sign-on functionality is implemented. Attackers can leverage this flaw to access sensitive data, modify system configurations, or establish persistent backdoors within the target environment. The long-term implications include compromised user trust, regulatory compliance violations, and potential financial losses from extended periods of unauthorized access.
Mitigation strategies should prioritize immediate patching of affected systems to version 5.4.4 or later, which includes enhanced SAML assertion validation mechanisms and strengthened signature verification processes. Organizations must implement comprehensive monitoring of SAML assertion processing logs to detect anomalous authentication patterns that could indicate exploitation attempts. Security teams should enforce strict certificate management practices, ensuring that only trusted identity providers can submit assertions to service providers. Additional defensive measures include implementing multi-factor authentication requirements for privileged accounts, establishing network segmentation between SAML components, and conducting regular security assessments of federated identity environments. The remediation process must also involve validating all existing sessions and resetting credentials for affected users to prevent continued exploitation of compromised access tokens.