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TI-2026-83442 Aliases CVE-2026-63399

Unauthenticated organization creation in Coop GraphQL API

Priority HIGH 70CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Coop, an open source review and moderation tool from roostorg, before 1.0.0 lets an unauthenticated remote attacker create arbitrary organizations through the GraphQL Mutation.createOrg operation on publicly accessible instances (CWE-306). The lack of rate limiting also fills the logs and could lead to database exhaustion. Running the service on an authenticated private network keeps outside actors from reaching the GraphQL API.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Coop is an open source review and moderation tool from ROOST. Prior to 1.0.0, the `GraphQL` `Mutation.createOrg` operation allows an unauthenticated actor to create arbitrary organizations on a publicly accessible instance. In addition to creating noise in the logs, the lack of rate limiting could potentially lead to database exhaustion. Running the service on an authenticated private network prevents outside actors from directly querying the `GraphQL` API. This issue is fixed in version 1.0.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Fixed coop (roostorg): 1.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
roostorgcoopbefore 1.0.01.0.0Patch availableCNA
  • coop Vendorroostorg Affected before 1.0.0 Fixed in 1.0.0 Patch available CNA

Remediation

Update roostorg coop to version 1.0.0, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA coop (roostorg) Fixed in 1.0.0

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-63399
  2. 2026-11-01 Priority changed: MEDIUM → LOW
  3. 2026-11-06 CISA SSVC decision points changed
  4. 2026-11-06 Priority changed: LOW → HIGH

References

Other 4

  • TI-2026-83441 Coop exposes organization and user data through unauthenticated GraphQL query CVSS 4.0HIGH 8.7
  • TI-2026-83445 Coop SAML login flaw allows cross-tenant account takeover CVSS 4.0HIGH 7.4
  • TI-2026-83443 Coop lets users alter other organizations' review queue access CVSS 4.0MEDIUM 5.3
  • TI-2026-83446 Coop sessions stay valid after password reset CVSS 4.0LOW 2.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences