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Budibase EUVDEUVD-2026-87659

| CVE-2026-100686 HIGH
Improper Privilege Management (CWE-269)
2026-09-26 VulnCheck GHSA-9mjc-4gf6-xhx7
8.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/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
vuln.today AI
9.6 CRITICAL

Authenticated builder (PR:L) over network with low complexity crosses a workspace/authorization boundary (S:C) to gain admin, yielding high confidentiality and integrity impact but no availability effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
POC Analysis Generated
Sep 26, 2026 - 19:20 vuln.today
Metadata Corrected
Sep 26, 2026 - 14:40 vuln.today
tag: Node.js added
Analysis Generated
Sep 26, 2026 - 14:20 vuln.today
Patch available
Sep 26, 2026 - 14:02 EUVD
CVE Published
Sep 26, 2026 - 13:23 cve.org
HIGH 8.6

DescriptionCVE.org

Budibase versions before 3.45.0 fail to validate per-app authorization in the POST /api/global/groups/:groupId/apps endpoint, allowing builders to assign application roles across workspace boundaries. A builder of a single workspace can exploit missing per-app authorization checks to grant themselves admin roles in other workspaces by modifying user group role mappings.

AnalysisAI

Authenticated privilege escalation in Budibase Server before 3.45.0 lets a low-privileged 'builder' account grant itself administrative roles in other workspaces. The flaw resides in the POST /api/global/groups/:groupId/apps endpoint, which fails to validate per-app authorization, allowing a builder who only has rights in one workspace to rewrite user-group role mappings for applications outside their own tenant boundary. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Requires an authenticated low-privileged 'builder' account in at least one Budibase workspace, and the target must be a multi-workspace deployment (shared/multi-tenant hosting) so that other workspaces exist to attack. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine authorization flaw with real privilege-escalation impact, but the raw 8.6 score overstates the immediate threat. … 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 Budibase Server to 3.45.0 or later, which is the vendor-released fix that restores per-app authorization checks on POST /api/global/groups/:groupId/apps; the patch is confirmed available from the vendor and full details are in the advisory at https://github.com/Budibase/budibase/security/advisories/GHSA-pp5r-q4fp-mcj3. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory every Budibase Server instance and identify any running a version earlier than 3.45.0, prioritizing internet-facing and multi-tenant or multi-workspace deployments; upgrade those systems to Budibase Server 3.45.0, the vendor-released patch version, and in parallel review builder accounts plus recent changes to user-group role mappings made through POST /api/global/groups/:groupId/apps for signs of unauthorized escalation. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-87659 vulnerability details – vuln.today

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