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CVE-2026-44895— GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

Quick assessment

Affected
yoda-digital mcp-gitlab-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitLab MCP Server是yoda.digital开源的一个连接AI代理与GitLab仓库的MCP服务器工具。 GitLab MCP Server 0.6.0之前版本存在安全漏洞，该漏洞源于HTTP传输层无任何身份验证机制且响应包含通配符Access-Control-Allow-Origin: *，SSE服务器暴露基于操作员GITLAB_PERSONAL_ACCESS_TOKEN的有状态RPC端点，且默认绑定0.0.0.0接口。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
yoda-digital mcp-gitlab-server < 0.6.0 affected
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I. Basic Information for CVE-2026-44895

Vulnerability Information
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Vulnerability Title
GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: * on every response. The structural defect is that the SSE server stands up a stateful, mutation-capable RPC endpoint that is backed by the operator's GITLAB_PERSONAL_ACCESS_TOKEN without any inbound credential check, then advertises itself to every cross-origin browser context via the wildcard CORS header. The httpServer.listen(port) call at line 97 also passes no host argument, so the bind defaults to 0.0.0.0 and exposes the auth-less surface on every interface. This vulnerability is fixed in 0.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab MCP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab MCP Server是yoda.digital开源的一个连接AI代理与GitLab仓库的MCP服务器工具。 GitLab MCP Server 0.6.0之前版本存在安全漏洞，该漏洞源于HTTP传输层无任何身份验证机制且响应包含通配符Access-Control-Allow-Origin: *，SSE服务器暴露基于操作员GITLAB_PERSONAL_ACCESS_TOKEN的有状态RPC端点，且默认绑定0.0.0.0接口。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
yoda-digital mcp-gitlab-server < 0.6.0 -

II. Public POCs for CVE-2026-44895

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III. Intelligence Information for CVE-2026-44895

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Vendor Advisories for CVE-2026-44895 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306