{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81099", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-26T16:00:33.425Z", "datePublished": "2026-08-27T14:50:39.029Z", "dateUpdated": "2026-08-27T14:50:39.029Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-08-27T14:50:39.029Z"}, "datePublic": "2026-08-26T00:00:00.000Z", "title": "Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List", "descriptions": [{"lang": "en", "value": "tiger-slack started its MCP HTTP transport without enabling the host allow-list the underlying SDK provides. mcp/src/httpServer.ts called the shared httpServerFactory helper and never set the DNS-rebinding-protection option, so the transport accepted a request whatever host it named, and a page in a browser could point a name it controlled at the address the server was bound to and drive the locally reachable Slack MCP server through the visitor's browser. The fix passes the option explicitly alongside a dependency update; the update alone would not have closed it. The repository publishes no release that brackets the fix, so the affected boundary is the commit preceding it."}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-346", "description": "Origin Validation Error", "type": "CWE"}]}], "affected": [{"vendor": "timescale", "product": "tiger-slack", "collectionURL": "https://github.com/timescale/tiger-slack", "repo": "https://github.com/timescale/tiger-slack", "defaultStatus": "unaffected", "versions": [{"version": "23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09", "status": "unaffected", "versionType": "git"}, {"version": "0", "status": "affected", "versionType": "git", "lessThan": "23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.6, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.8, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"}}], "references": [{"url": "https://github.com/timescale/tiger-slack", "tags": ["product"]}, {"url": "https://github.com/timescale/tiger-slack/pull/146", "tags": ["issue-tracking"]}, {"name": "VulnCheck Advisory: Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/timescale-tiger-slack-dns-rebinding-via-disabled-host-header-allow-list"}], "credits": [{"lang": "en", "value": "Avishai Gonen (Pluto Security)", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}, "source": {"discovery": "UNKNOWN"}}}}

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