# CVE-2026-1237: GO-2026-4388 - Juju has broken CMR authorization in github.com/juju/juju

Source: https://junglewise.ai/threats/cve-2026-1237-juju-has-broken-cmr-authorization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-02  
License: CC BY 4.0 with a link back

CVE-2026-1237 · Severity: medium · CVSS 4 · Published 2026-02-02

Juju has broken CMR authorization in github.com/juju/juju

Technologies: [github.com/juju/juju (Go)](https://junglewise.ai/threats/technologies/github-com-juju-juju). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-1237 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-1237 being exploited in the wild.

**How severe is CVE-2026-1237?** Medium severity, with a CVSS score of 4, published 2 February 2026.

**Which products and versions are affected?** github.com/juju/juju (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=0.0.0-20260127110037-9b1a0e53a4a4.

**Is there a fix for CVE-2026-1237?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-1237?** Check whether you run github.com/juju/juju (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- github.com/juju/juju (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=0.0.0-20260127110037-9b1a0e53a4a4

## Identifiers

- CVE-2026-1237
- GHSA-j477-6vpg-6c8x
- GO-2026-4388

## Related threats

- [Canonical Juju race condition in API server userTokens map](https://junglewise.ai/threats/cve-2026-5774-canonical-juju-race-condition-in-api-server-usertokens-map)
- [Canonical Juju improper authorization in Controller facade](https://junglewise.ai/threats/cve-2026-5412-canonical-juju-improper-authorization-in-controller-facade)
- [Canonical Juju incorrect authorization in resource handler](https://junglewise.ai/threats/cve-2025-68153-canonical-juju-incorrect-authorization-in-resource-handler)
- [Canonical Juju Incorrect Authorization in Debug Log Endpoint](https://junglewise.ai/threats/cve-2025-68152-canonical-juju-incorrect-authorization-in-debug-log-endpoint)
- [Juju has Improper TLS Client/Server authentication and certificate verification on Database Cluster](https://junglewise.ai/threats/cve-2026-4370-juju-has-improper-tls-client-server-authentication-and-certificate)