CVE-2026-50132

Summary

Budibase is an open-source low-code platform. Prior to 3.39.0, 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. This vulnerability is fixed in 3.39.0.

Affected Software

Weaknesses

• CWE-284: CWE-284: Improper Access Control
• CWE-352: CWE-352: Cross-Site Request Forgery (CSRF)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/Budibase/budibase/security/advisories/GHSA-v7j5-vc4m-723w

References

• https://github.com/Budibase/budibase/security/advisories/GHSA-v7j5-vc4m-723w

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