CVE-2026-42337

MEDIUM

MaxKB: Broken Access Control in MaxKB OSS URL Fetch API

Title source: cna

Description

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.

References (1)

Core 1

Core References

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https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-2jmj-gwvg-3gp2

Scores

CVSS v4 5.3

EPSS 0.0021

EPSS Percentile 10.8%

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-862

Status published

Products (1)

1Panel-dev/MaxKB < 2.8.1

Published May 26, 2026

Tracked Since May 27, 2026