CVE-2026-93336: Missing authorization in the unit resources download route in Juju controllers

Severity: high (CVSS 7.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-22 · updated 2026-10-23
Weakness: CWE-862

Description

Missing authorization in the unit resources download route in Canonical Juju 4.0 through 4.0.15 allows a controller-authenticated principal (a unit agent, or a user with only login permission) to read any application's charm resource in any model, including container-registry credentials, via a crafted request naming an arbitrary unit.

Affected products

Canonical Juju: from 4.0 before 4.0.16 — fixed in 4.0.16

How to fix

Upgrade to a fixed version: Canonical Juju 4.0.16. Check the vendor advisory for mitigations.

References

https://github.com/juju/juju/pull/23360
https://github.com/juju/juju/security/advisories/GHSA-fp7x-6hq5-3c3w

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