CVE-2026-111767High· 8.6▾ TwilightA flaw was found in the Model Context Protocol (MCP) TypeScript SDK (@modelcontextprotocol/sdk). The experimental task storage feature (taskStore) does not verify which client session created a given task when multiple clients share a task…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 47.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
Last analysed / modified upstream
0.3%
A flaw was found in the Model Context Protocol (MCP) TypeScript SDK (@modelcontextprotocol/sdk). The experimental task storage feature (taskStore) does not verify which client session created a given task when multiple clients share a task store. A remote attacker sharing the same server instance can exploit this flaw to list, read, and cancel tasks created by other sessions. This results in unauthorized information disclosure and disruption of task processing.
@modelcontextprotocol/sdk: @modelcontextprotocol/sdk: Unauthorized cross-session task access via taskStore — rated Important by Red Hat. Released 2026-10-20, updated 2026-10-21.
Affected:
No fix planned:
Not affected:
Affected
Affected packages:
@modelcontextprotocol/sdk >= 1.24.0, < 1.32.0Patched in:
@modelcontextprotocol/sdk 1.32.0Connected by shared product, vendor, weakness, or advisory.
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