{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77265",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-20T19:14:21.330Z",
        "datePublished": "2026-09-22T17:47:58.553Z",
        "dateUpdated": "2026-09-22T17:47:58.553Z"
    },
    "containers": {
        "cna": {
            "title": "MCP Atlassian: SSRF via DNS Rebinding in Header-Based Authentication Flow",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-918",
                            "lang": "en",
                            "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-49xv-9743-pw8w",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-49xv-9743-pw8w"
                },
                {
                    "name": "https://github.com/sooperset/mcp-atlassian/pull/1448",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/sooperset/mcp-atlassian/pull/1448"
                },
                {
                    "name": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460"
                },
                {
                    "name": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0"
                }
            ],
            "affected": [
                {
                    "vendor": "sooperset",
                    "product": "mcp-atlassian",
                    "versions": [
                        {
                            "version": "< 0.22.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-22T17:47:58.553Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a DNS-rebinding hostname that returns a public address during validation and an internal address during connection, causing requests to internal or metadata services. The advisory traces the vulnerable input and processing flow through X-Atlassian-Jira-Url, X-Atlassian-Confluence-Url, validate_url_for_ssrf, and DNS rebinding, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0."
                }
            ],
            "source": {
                "advisory": "GHSA-49xv-9743-pw8w",
                "discovery": "UNKNOWN"
            }
        }
    }
}