CVE-2026-42337CWE-862

MaxKB: Broken Access Control in MaxKB OSS URL Fetch API

Medium · published May 26, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
27.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
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
EPSS
0.00351 · 27.5th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-05-26T20:19Z
EPSS history
Timeline
  • 26 MAY 20:19Z
    MaxKB: Broken Access Control in MaxKB OSS URL Fetch API
    cvelistv5