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MaxKB EUVD-2026-31988

| CVE-2026-42337 MEDIUM
Missing Authorization (CWE-862)
2026-05-26 GitHub_M
Authentication Bypass
5.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
May 26, 2026 - 22:02 EUVD
Analysis Generated
May 26, 2026 - 21:35 vuln.today
CVSS changed
May 26, 2026 - 21:22 NVD
5.3 (MEDIUM)
CVE Published
May 26, 2026 - 20:19 nvd
UNKNOWN (no severity yet)

DescriptionNVD

MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a broken access control vulnerability in the OSS file service URL fetch API (chat/api/oss/get_url). The endpoint uses application_id from the URL path without validating ownership, allowing attackers to perform operations under other applications’ policies. This vulnerability is fixed in 2.8.1.

AnalysisAI

Broken access control in MaxKB 2.8.0 and earlier exposes the OSS file service URL fetch API (chat/api/oss/get_url) to cross-application data access by authenticated low-privilege users who supply arbitrary application_id values in the URL path. Because the endpoint performs no ownership validation against the requesting session, any authenticated user can retrieve OSS file URLs scoped to applications they do not own, violating multi-tenant isolation. …

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EUVD-2026-31988 vulnerability details – vuln.today
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