Description
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.
Severity (CVSS)
| Base score | 7.3 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
| Provided by | CNA |
Weaknesses
- CWE-284 — CWE-284: Improper Access Control
- CWE-352 — CWE-352: Cross-Site Request Forgery (CSRF)
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Budibase | budibase | < 3.39.0 |
References
- https://github.com/Budibase/budibase/security/advisories/GHSA-v7j5-vc4m-723w (x_refsource_CONFIRM)
Generated from the official CVE List on 27 Jun 2026 07:02 UTC.