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

{
    "lastseen": "",
    "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.",
    "published": "2026-05-26T21:08:13.107Z",
    "modified": "2026-05-26T21:08:13.107Z",
    "type": "cve",
    "title": "GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools",
    "source": "GitHub_M",
    "references": "https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf",
    "id": "CVE-2026-44895",
    "bulletinFamily": "",
    "cwe": [
        "CWE-306",
        "CWE-942"
    ],
    "cvelist": null,
    "sourceData": "yoda-digital mcp-gitlab-server < 0.6.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.2,
        "severity": "CRITICAL",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "mcp-gitlab-server",
    "version": "< 0.6.0",
    "vendor": "yoda-digital",
    "ai_description": "The GitLab MCP Server has a vulnerability where the HTTP transport has no authentication layer and a wildcard Access-Control-Allow-Origin, allowing unauthorized access to GitLab tools.",
    "ai_severity": "Critical",
    "ai_vendor": "yoda-digital",
    "ai_product": "mcp-gitlab-server",
    "ai_version": "< 0.6.0",
    "ai_score": 9.2
}