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CVE-2026-81099: Origin Validation Error in timescale tiger-slack

0
High
VulnerabilityCVE-2026-81099cvecve-2026-81099
Published: 08/27/2026 (08/27/2026, 14:50:39 UTC)
Source: CVE Database V5
Vendor/Project: timescale
Product: tiger-slack

Description

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.

CVSS v4.0

Score 7.6high

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Passive
Vuln. Confidentiality
High
Vuln. Integrity
High
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
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

Affected software

GitHub Actionsmore threats →cve
tiger-slack
pkg:github/tiger-slack

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Technical Details

Data Version
5.2
Assigner Short Name
VulnCheck
Date Reserved
2026-08-26T16:00:33.425Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a906bb2acd9273b4983a180

Added to database: 08/27/2026, 16:54:10 UTC

Last updated: 08/28/2026, 00:59:15 UTC

Views: 8

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