GCD AI RADAR
incidents/AIR-2025-0436

CVE-2025-34072: Data exfiltration vulnerability in Anthropic Slack MCP Server

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerabilityAgent hijack

A data exfiltration vulnerability affects Anthropic's deprecated Slack Model Context Protocol Server through automatic link unfurling. Manipulated AI agent messages can cause zero-click data exfiltration via external preview requests.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerabilityprimary
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
  • Agent hijack
    An AI agent is tricked into unauthorized actions: tool misuse, data exfiltration through the agent, or acting against its principal.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Anthropic, Framework / tooling
products
Slack Model Context Protocol Server
incident date
2 Jul 2025
first reported
2 Jul 2025
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2025-34072 · data-exfiltration · mcp
record
created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z · json

Sources · 1

  1. 2025-07-02
    CVE-2025-34072: A data exfiltration vulnerability exists in Anthropic’s deprecated Slack Model Context Protocol (MCP) Server via automatic link…
    NVD · nvd.nist.gov/vuln/detail/CVE-2025-34072

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