CVE-2026-73497

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{"affected": [{"affectedData": [{"product": "mcp-atlassian", "vendor": "sooperset", "versions": [{"status": "affected", "version": ">= 0.17.0, < 0.22.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). From 0.17.0 until 0.22.0, validate_url_for_ssrf resolves the attacker-controlled X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url header host once at middleware time, but the outbound request is built with the raw hostname and resolves it again at connection time with no IP pinning. An attacker-controlled DNS-rebinding name can return a public IP during validation and 169.254.169.254 or another internal IP during connection, enabling unauthenticated server-side requests to cloud metadata or internal services. The flaw spans src/mcp_atlassian/utils/urls.py, src/mcp_atlassian/servers/main.py, and src/mcp_atlassian/servers/dependencies.py; validate_url_for_ssrf returns only a verdict rather than a pinned IP, UserTokenMiddleware processes the attacker-controlled headers before fetcher creation, and the Jira and Confluence fetchers use the raw hostname. This issue is fixed in version 0.22.0."}], "id": "CVE-2026-73497", "lastModified": "2026-09-30T17:51:56.193", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73497", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-15T13:25:24.644811Z", "version": "2.0.3"}}]}, "published": "2026-09-14T20:16:50.993", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460"}, {"source": "security-advisories@github.com", "url": "https://github.com/sooperset/mcp-atlassian/pull/1448"}, {"source": "security-advisories@github.com", "url": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-489g-7rxv-6c8q"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.17.0,0.22.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mcp-atlassian", "source": "cna", "vendor": "sooperset"}, "product": "mcp-atlassian", "vendor": "sooperset"}], "created": "2026-09-15T05:15:13.299905+00:00", "updated": "2026-09-20T22:30:06.021536+00:00", "vendors": ["sooperset", "sooperset$PRODUCT$mcp-atlassian"]}