EUVD-2026-66126Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-exploitable cross-tenant IDOR requiring only workspace membership (PR:L); scope changes to victim workspace (S:C); no confidentiality impact but full integrity and availability loss for victim domain.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
3DescriptionCVE.org
TypeBot is a chatbot builder tool. Prior to 3.18.0, any authenticated non-guest workspace member can remove another workspace's public custom domain and make typebots on that domain unavailable. The custom-domain delete handler in handleDeleteCustomDomain.ts authorizes a caller against a client-supplied workspaceId but sends the client-supplied domain name to the shared Vercel project before verifying that the domain belongs to that workspace. This issue is fixed in version 3.18.0.
AnalysisAI
Cross-workspace domain deletion in TypeBot prior to 3.18.0 allows any authenticated non-guest workspace member to remove custom domains belonging to other workspaces, rendering their chatbots unavailable. The handleDeleteCustomDomain API handler validates the caller's membership in a client-supplied workspaceId but forwards the client-supplied domain name to the shared Vercel project API without confirming that domain is owned by the authorized workspace - a classic IDOR flaw (CWE-639). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold an authenticated TypeBot workspace account with at minimum member-level access (non-guest role) in any workspace on the target TypeBot deployment - the attacker's workspace need not be related to the victim's. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.4 with PR:L correctly reflects that exploitation requires a valid, non-guest workspace account, which bars fully unauthenticated internet attackers. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade TypeBot to version 3.18.0 or later; this is the vendor-released patch per the GitHub release at https://github.com/baptisteArno/typebot.io/releases/tag/v3.18.0 and the patch commit at https://github.com/baptisteArno/typebot.io/commit/06575dfcd461ba76071012869d4b1f4046f9a6b8. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
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External POC / Exploit Code
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