CVE-2026-34237GHSA-HV2W-8MJJ-JW22
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.0.1, 1.1.1, 0.18.3
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
MCP 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 hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- modelcontextprotocol java-sdk
From 1.0.0 · fixed in 1.0.1; From 1.1.0 · fixed in 1.1.1; fixed in 0.18.3
- io.modelcontextprotocol.sdk:mcp-coreMaven
From 1.0.0 · fixed in 1.0.1
- io.modelcontextprotocol.sdk:mcp-coreMaven
From 1.1.0 · fixed in 1.1.1
- io.modelcontextprotocol.sdk:mcp-coreMaven
fixed in 0.18.3