GHSA-v7j5-vc4m-723w: Budibase has an Account Impersonation Issue — Chat Identity Link Hijacking via Missing Consent & CSRF

Title Chat Identity Link Hijacking — Attacker Can Silently Map Their Slack/Discord Identity to Any Authenticated Budibase User's Account Severity High — CVSS 3.1: AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N = 7.3 Affected Product - Product: Budibase - Version: 3.37.2 (introduced in this version) - Component: packages/server/src/api/controllers/ai/chatIdentityLinks.ts - Endpoint: GET /api/chat-links/:instance/:token/handoff Vulnerability Type - CWE-352: Cross-Site Request Forgery - CWE-284: Improper Access Control Vulnerability Description GET /api/chat-links/:instance/:token/handoff is a public endpoint (no auth required) that performs a permanent, state-changing operation: it binds an external chat identity (Slack/Discord/MS Teams) to an authenticated Budibase user account, with no consent UI and no CSRF protection. The session token in the URL is created by the attacker (from their own /link slash command) and embeds the attacker's externalUserId. When an authenticated Budibase victim visits the URL, their account is silently and permanently linked to the attacker's Slack/Discord identity. The server responds with "Authentication succeeded." — no indication of what was linked. Route Registration // packages/server/src/api/routes/chat.ts:22 router.get( "/api/chat-links/:instance/:token/handoff", controller.handoffChatLinkSession // registered in publicRoutes — zero auth middleware ) Vulnerable Controller (full function) // packages/server/src/api/controllers/ai/chatIdentityLinks.ts:61–110 export async function handoffChatLinkSession( ctx: UserCtx<void, string, { instance: string; token: string }> ) { const token = resolveToken(ctx.params.token) const session = await sdk.ai.chatIdentityLinks.getChatIdentityLinkSession(token) if (!session) { throw new HTTPError("Link token is invalid or has expired", 400) } assertSessionMatchesInstance({ workspaceId: session.workspaceId, instance: ctx.params.instance }) if (!ctx.isAuthenticated) { // Unauthenticated: set retur