Threats Tagged 'ghsa-p3qg-h7r3-79xr'
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Threats Tagged 'ghsa-p3qg-h7r3-79xr'
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GHSA-p3qg-h7r3-79xrCVE-2026-4339 0 Mattermost versions 10.11.x up to 10.11.18, 11.6.x up to 11.6.3, and 11.5.x up to 11.5.6 contain a vulnerability in the Mattermost Agents plugin MCP server. The vulnerability allows an attacker with access to the MCP server in stdio mode to perform server-side request forgery (SSRF) by supplying internal URLs as file attachments in post creation requests. This occurs because the plugin fails to validate attachment URLs against internal or private IP ranges. The vulnerability can lead to exfiltration of data from internal network services. Join the discussion | GCVE Database | 06/26/2026, 15:32:15 UTC Added: 06/26/2026, 22:05:23 UTC |
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