WS-2026-0154

@payloadcms/plugin-mcp 0.0.1-alpha.0, 3.61.0 through 3.87.1 and 4.0.0-canary.0 through 4.0.0-canary.30: the MCP login tool let the caller set showHiddenFields and overrideAccess on 3.x, so login responses could return hidden fields such as credential data GHSA-jjm7-864w-gg8q...