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CVE-2026-70557: CWE-639 Authorization bypass through User-Controlled key in diboot diboot-core

0
Medium
VulnerabilityCVE-2026-70557cvecve-2026-70557cwe-639
Published: 08/06/2026 (08/06/2026, 19:16:18 UTC)
Source: CVE Database V5
Vendor/Project: diboot
Product: diboot-core

Description

diboot-core contains an authorization bypass vulnerability in its POST /common/load-related-data endpoint. This endpoint allows any authenticated user, including those with minimal privileges, to access sensitive fields from any entity without restriction. The security check intended to prevent unauthorized access always returns true, effectively disabling protection. As a result, secret fields such as admin password hashes can be retrieved and potentially cracked, leading to full administrative takeover. The vulnerable endpoint is used by the official diboot-admin-ui frontend, making this a significant risk in default deployments. No patch or official remediation has been published yet.

CVSS v3.1

Score 6.5medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/06/2026, 22:42:38 UTC

Technical Analysis

The diboot-core library's POST /common/load-related-data endpoint resolves user-supplied field names to any @TableField column of any entity and returns all rows' values without any allowlist filtering. The relatedDataSecurityCheck() function, which should enforce authorization, unconditionally returns true, allowing any authenticated user to read sensitive fields, including those annotated with @JsonIgnore such as IamAccount.authSecret and IamAccount.secretSalt. These fields contain password hashes protected by Shiro's two-iteration MD5 with an 8-character salt, which is easily crackable offline. Consequently, attackers can recover admin credentials and gain full administrative control. The vulnerability persists in the development branch under the renamed attachMore* mechanism, where attachMoreSecurityCheck() also returns true unconditionally. The official diboot-admin-ui frontend relies on this endpoint, exposing deployments that follow vendor recommendations. No official fix or patch is currently available.

Potential Impact

Any authenticated user, even with minimal privileges, can bypass authorization controls to access sensitive secret fields across all entities. This includes admin password hashes that can be cracked offline due to weak hashing, enabling full administrative takeover. The vulnerability compromises confidentiality and potentially leads to complete system compromise without requiring elevated privileges or user interaction.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the vulnerable endpoint by limiting authenticated user permissions or disabling the endpoint if possible. Review and harden authorization checks on endpoints that expose entity fields. Monitor vendor communications for official patches or updates.

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Technical Details

Data Version
5.2
Assigner Short Name
VulnCheck
Date Reserved
2026-08-04T19:19:05.906Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a75070bbf8831d5395f5c45

Added to database: 08/06/2026, 22:13:31 UTC

Last enriched: 08/06/2026, 22:42:38 UTC

Last updated: 08/06/2026, 23:56:53 UTC

Views: 3

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