CVE-2026-1237

Unauthorized cross-model access via unverified macaroon caveats

Published Jan 28, 2026 · Updated Jan 28, 2026

Improper authorization in Canonical Juju 2.9.x, 3.6.x, and 4.x allows remote authenticated users to retain revoked cross-model access. The controller accepts caveats from a macaroon it cannot validate after a missing root key or expiration, then uses those untrusted claims to mint a valid macaroon. A user able to update database records can impersonate an authorized user and keep consuming a cross-model offer after permission expires or is revoked.

CVSS severity2.1
Low
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Canonical Juju 2.9.x, 3.6.x, and 4.x allows remote authenticated users to retain revoked cross-model access. The controller accepts caveats from a macaroon it cannot validate after a missing root key or expiration, then uses those untrusted claims to mint a valid macaroon. A user able to update database records can impersonate an authorized user and keep consuming a cross-model offer after permission expires or is revoked.

The record

CVE
CVE-2026-1237
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
Canonical
Product
Juju
Classifications
CWE-672, CWE-347, T1550.001
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Canonical · Jujuversion=0

Published CVSS scores

2.1Canonical Ltd.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-672Operation on a Resource after Expiration or Release
CWE-347Improper Verification of Cryptographic Signature
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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