Vulnerability · Published May 26, 2026 · Assigned by GitHub_M

CVE-2026-42336MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch

Medium 5.1

In plain English

A medium-severity server-side request forgery in MaxKB from 1Panel-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.2%top 89.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch functionality due to inconsistent DNS resolution between validation and actual request execution, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.

Affected products (as reported)

Vendor	Product	Versions
1Panel-dev	MaxKB	< 2.8.1

Weakness: CWE-367, CWE-918 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-6m4p-9wwc-4q5q x_refsource_CONFIRM