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Java CVE-2026-6620

| EUVD-2026-23811 LOW
Path Traversal (CWE-22)
2026-04-20 VulDB GHSA-8v5m-jghx-mmxr
2.1
CVSS 4.0 · NVD

Severity by source

NVD PRIMARY
2.1 LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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

8
Severity Changed
Apr 29, 2026 - 01:12 NVD
MEDIUM LOW
CVSS changed
Apr 29, 2026 - 01:12 NVD
5.3 (MEDIUM) 2.1 (LOW)
PoC Detected
Apr 29, 2026 - 01:00 vuln.today
Public exploit code
CVSS changed
Apr 20, 2026 - 09:37 NVD
6.3 (MEDIUM) 5.3 (MEDIUM)
Analysis Generated
Apr 20, 2026 - 08:58 vuln.today
EUVD ID Assigned
Apr 20, 2026 - 08:45 euvd
EUVD-2026-23811
Analysis Generated
Apr 20, 2026 - 08:45 vuln.today
CVE Published
Apr 20, 2026 - 08:15 nvd
LOW 2.1

DescriptionCVE.org

A vulnerability was found in SonicCloudOrg sonic-server up to 2.0.0. The affected element is the function Upload of the file FileTool.java of the component File Upload Endpoint. The manipulation of the argument Type results in path traversal. The attack may be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Remote authenticated path traversal in SonicCloudOrg sonic-server up to version 2.0.0 allows attackers with low-level privileges to manipulate the Type parameter in the File Upload Endpoint (FileTool.java) to traverse the filesystem and read or write arbitrary files. The vulnerability has publicly available exploit code and affects all versions up to 2.0.0; the vendor has not responded to early disclosure attempts, leaving no patch available.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain low-privilege credentials or account
Delivery
Authenticate to sonic-server instance
Exploit
Craft malicious file upload request with traversal sequences in Type parameter
Install
Send request to File Upload Endpoint
C2
Endpoint processes traversal sequences without validation
Execute
Arbitrary file read or write outside upload directory
Impact
Extract sensitive data or inject malicious content

Vulnerability AssessmentAI

Exploitation Exploitation requires: (1) Valid low-privilege user authentication to access the File Upload Endpoint (PR:L in CVSS vector confirms authentication is mandatory); (2) The Type parameter must be passed to the Upload function without sanitization (confirmed in description as the affected parameter); (3) The application must process the parameter directly in filesystem operations, allowing directory traversal sequences to be interpreted. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This vulnerability presents moderate real-world risk with notable limitations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privilege user account on a sonic-server instance crafts a malicious file upload request, manipulating the Type parameter to include path traversal sequences such as '../../etc/passwd' or '../../sensitive_config.properties'. The vulnerable Upload endpoint fails to sanitize this input and processes the traversal, allowing the attacker to read sensitive configuration files, database credentials, or other protected files outside the intended upload directory. …
Remediation No vendor-released patch is available; the vendor did not respond to early disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-6620 vulnerability details – vuln.today

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