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MaxKB EUVDEUVD-2026-39527

| CVE-2026-56779 MEDIUM
Server-Side Request Forgery (SSRF) (CWE-918)
2026-06-25 VulnCheck GHSA-395g-c5fv-7hfh
SSRF Maxkb
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/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
vuln.today AI
5.0 MEDIUM

Network-accessible SSRF requiring low-privilege authentication (PR:L); scope change (S:C) because internal systems beyond the vulnerable application are reachable via the server-side request; no integrity or availability impact on either the vulnerable or subsequent system.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/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

2
Source Code Evidence Fetched
Jun 25, 2026 - 18:58 vuln.today
Analysis Generated
Jun 25, 2026 - 18:58 vuln.today

DescriptionCVE.org

MaxKB before 2.10.0 contains a server-side request forgery vulnerability in tool creation and update endpoints that allows authenticated users to make arbitrary server requests by supplying unvalidated downloadCallbackUrl and download_url parameters. Attackers with default workspace USER role can exploit this to access internal network services by providing malicious URLs to the ToolSerializer endpoints.

AnalysisAI

Server-side request forgery in MaxKB before 2.10.0 allows any authenticated user holding the default workspace USER role to coerce the application server into making arbitrary HTTP requests to attacker-controlled destinations via the downloadCallbackUrl and download_url parameters on ToolSerializer endpoints. An attacker can pivot through the MaxKB host to probe and extract data from internal network services - cloud metadata APIs, internal databases, adjacent microservices - that would otherwise be inaccessible from outside the network perimeter. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain default MaxKB USER role credentials
Delivery
Craft tool create or update request with internal or metadata URL in download_url or downloadCallbackUrl
Exploit
Submit request to ToolSerializer API endpoint
Execution
MaxKB server issues HTTP request to attacker-specified URL from its internal network position
Impact
Attacker receives response body containing internal service data or cloud metadata credentials
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated session with at least the default workspace USER role - this is the minimum role assigned to users of MaxKB and is broadly distributed, not an elevated or administrative role. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) scores 5.3 and accurately characterizes low-complexity, network-reachable exploitation requiring only low-privilege authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a valid MaxKB USER role account submits a tool creation API request with `download_url` set to http://169.254.169.254/latest/meta-data/iam/security-credentials/ on a cloud-hosted MaxKB instance. The MaxKB server fetches the URL from its privileged network position and returns the cloud instance's IAM role credentials in the response, enabling the attacker to escalate access to cloud resources far beyond the MaxKB application. …
Remediation Upgrade MaxKB to version 2.10.0 or later, which incorporates the fix at commit 6c156afc656afa62ea4280e504a06ac1c9696b36 (https://github.com/1Panel-dev/MaxKB/commit/6c156afc656afa62ea4280e504a06ac1c9696b36). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-39527 vulnerability details – vuln.today
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