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Vulnerability record · CVE-2026-35568 · published 7 April 2026

CVE-2026-35568: Lfprojects mcp java sdk origin validation error vulnerability

Lfprojects · Mcp Java Sdk

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to 1.0.0, the java-sdk contains a DNS rebinding vulnerability. This vulnerability allows an attacker to access a locally or network-private java-sdk MCP server via a victims browser that is either local, or network adjacent. This allows an attacker to make any tool call to the server as if they were a locally running MCP connected AI agent. This vulnerability is fixed in 1.0.0.

7.6 CVSS 4.0 High EPSS 0.20% · top 91.2% CWE-346 · Origin validation error
7.6CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to 1.0.0, the java-sdk contains a DNS rebinding vulnerability. This vulnerability allows an attacker to access a locally or network-private java-sdk MCP server via a victims browser that is either local, or network adjacent. This allows an attacker to make any tool call to the server as if they were a locally running MCP connected AI agent. This vulnerability is fixed in 1.0.0.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/modelcontextprotocol/java-sdk/releases/tag/v1.0.0 Release Notes
https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-8jxr-pr72-r468 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.1CVE-2026-34237Lfprojects mcp java sdk vulnerabilityMCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcode…EPSS 0.31%9.4CVE-2025-34291Langflow CORS misconfiguration leads to token theft and RCELangflow up to and including 1.6.9 ships an overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) and a refresh token …KEVEPSS 93%analysed8.8CVE-2015-4495Firefox PDF reader same-origin bypass allows file read and privilege gainThe PDF reader in Mozilla Firefox (before 39.0.3), Firefox ESR 38.x (before 38.1.1), and Firefox OS (before 2.2) fails to properly validate origin, l…KEVEPSS 69%analysed

Source: NIST National Vulnerability Database (record CVE-2026-35568), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.