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A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so.

CVE-2026-2460 is a vulnerability identified in Hitachi Energy's Relion REB500, specifically version 8.0.0.0. The issue arises from a misconfiguration or design flaw in the privilege definitions associated with the DAC protocol, which governs access control to directories within the system. Authenticated users with low-level privileges can exploit this flaw to access and alter directory contents beyond their authorized scope. This is classified under CWE-267, indicating that privileges are defined with unsafe actions, allowing unauthorized operations. The vulnerability does not require user interaction but does require the attacker to be authenticated with low-level access, which lowers the barrier compared to higher privilege exploits but still requires initial access. The CVSS 4.0 vector indicates network attack vector (AV:N), high attack complexity (AC:H), no privileges required beyond low-level (PR:L), no user interaction (UI:N), and high impact on confidentiality and integrity (VC:H, VI:H) but no impact on availability or authentication bypass. No patches or known exploits are currently available, but the vulnerability poses a significant risk due to the potential for unauthorized data manipulation within critical energy infrastructure systems. The flaw could be exploited by insiders or external attackers who have gained low-level access, enabling privilege escalation or unauthorized data tampering, which could disrupt operations or compromise sensitive information.

Detailed information about CVE-2026-2460: CWE-267 Privilege Defined with Unsafe Actions in Hitachi Energy Relion REB500 affecting Hitachi Energy Relion REB500. 

CVE-2026-2460: CWE-267 Privilege Defined with Unsafe Actions in Hitachi Energy Relion REB500 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-2460: CWE-267 Privilege Defined with Unsafe Actions in Hitachi Energy Relion REB500

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