CVE-2026-42335CWE-918

MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy

Medium · published May 26, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
30.0
In the wild
Unconfirmed
What it is

MaxKB is an open-source AI assistant for enterprise. Prior to 2.8.1, MaxKB v2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch (chat/api/oss/get_url) endpoint. The vulnerability exists due to inconsistent URL parsing between the urlparse validation function and the requests HTTP client, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
EPSS
0.00372 · 30.0th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-05-26T20:09Z
EPSS history
Timeline
  • 26 MAY 20:09Z
    MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy
    cvelistv5