Vulnerability-Lookup

CVE-2026-1237 (GCVE-0-2026-1237)

Vulnerability from cvelistv5 – Published: 2026-01-28 15:01 – Updated: 2026-01-28 15:06

Summary

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.

Severity

2.1 (Low)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-672 - Operation on a Resource after Expiration or Release
CWE-347 - Improper Verification of Cryptographic Signature

Assigner

canonical

References

1 reference

URL	Tags
https://github.com/juju/juju/security/advisories/…

Impacted products

1 product

Vendor	Product	Version
Canonical	juju	Affected: 0 (semver)

Show details on NVD website

JSON

To clipboard

{
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                "id": "CVE-2026-1237",
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                  },
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FKIE_CVE-2026-1237

Vulnerability from fkie_nvd - Published: 2026-01-28 15:16 - Updated: 2026-06-17 10:15

Severity

2.1 (Low) - 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

Summary

References

	URL	Tags
	security@ubuntu.com	https://github.com/juju/juju/security/advisories/GHSA-j477-6vpg-6c8x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "juju",
          "vendor": "Canonical",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@ubuntu.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vulnerable cross-model authorization in juju. If a charm\u0027s 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."
    },
    {
      "lang": "es",
      "value": "Autorizaci\u00f3n entre modelos vulnerable en juju. Si los permisos entre modelos de un charm son revocados o expiran, un usuario malintencionado que es capaz de actualizar registros de la base de datos puede acu\u00f1ar un macaroon inv\u00e1lido que es validado incorrectamente por el controlador de juju, permitiendo que un charm mantenga permisos que de otro modo estar\u00edan revocados o expirados. Esto permite a un charm continuar relacion\u00e1ndose con otro charm en una relaci\u00f3n entre modelos, y usar su carga de trabajo sin su permiso. No hay soluci\u00f3n disponible al momento de escribir."
    }
  ],
  "id": "CVE-2026-1237",
  "lastModified": "2026-06-17T10:15:22.627",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.1,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security@ubuntu.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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    {
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    }
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}

GHSA-J477-6VPG-6C8X

Vulnerability from github – Published: 2026-01-29 15:21 – Updated: 2026-01-29 15:21

Summary

Juju has broken CMR authorization

Details

Impact

Cross-model Relation authorization is broken and has a potential security vulnerability. If the controller does not have the root key to verify the macaroon (or if the macaroon has expired), an unvalidated and therefore untrusted macaroon is used to extract declared caveats. Facts from these caveats are then blindly used to mint a new macaroon that becomes valid.

Scenario

A user knows that user X has access to offer Y. The user mints a macaroon stating that user X has access to offer Y and sends it to the controller in a request. The controller fails to verify the macaroon because it lacks the root key and mints a new macaroon requiring proof that user X has access to offer Y. Since user X does have access and the discharge endpoint does not require authentication, the controller returns the new macaroon. The user can then use the returned macaroon to consume the offer as user X.

Patches

N/A

Workarounds

A previous proposal via this PR addresses the issue but would break model migrations since macaroon root keys are not included in model descriptions. Additionally, root keys are not model-scoped, making it unclear which keys to transfer during migration.

Severity

2.1 (Low)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/juju/juju"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.0.0-20260127110037-9b1a0e53a4a4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-1237"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-29T15:21:27Z",
    "nvd_published_at": "2026-01-28T15:16:16Z",
    "severity": "LOW"
  },
  "details": "### Impact\n\nCross-model Relation authorization is broken and has a potential security vulnerability. If the controller does not have the root key to verify the macaroon (or if the macaroon has expired), an unvalidated and therefore untrusted macaroon is used to extract declared caveats. Facts from these caveats are then blindly used to mint a new macaroon that becomes valid.\n\n### Scenario\n\nA user knows that user X has access to offer Y. The user mints a macaroon stating that user X has access to offer Y and sends it to the controller in a request. The controller fails to verify the macaroon because it lacks the root key and mints a new macaroon requiring proof that user X has access to offer Y. Since user X does have access and the discharge endpoint does not require authentication, the controller returns the new macaroon. The user can then use the returned macaroon to consume the offer as user X.\n\n### Patches\n\nN/A\n\n### Workarounds\n\nA previous proposal via [this PR](https://github.com/juju/juju/pull/21062) addresses the issue but would break model migrations since macaroon root keys are not included in model descriptions. Additionally, root keys are not model-scoped, making it unclear which keys to transfer during migration.",
  "id": "GHSA-j477-6vpg-6c8x",
  "modified": "2026-01-29T15:21:27Z",
  "published": "2026-01-29T15:21:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/juju/juju/security/advisories/GHSA-j477-6vpg-6c8x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1237"
    },
    {
      "type": "WEB",
      "url": "https://github.com/juju/juju/pull/21062"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/juju/juju"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Juju has broken CMR authorization"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-1237 (GCVE-0-2026-1237)

FKIE_CVE-2026-1237

GHSA-J477-6VPG-6C8X

Impact

Scenario

Patches

Workarounds

Tags

Sightings

Nomenclature