Vulnerability-Lookup

GHSA-Q623-F4J4-P4XJ

Vulnerability from github – Published: 2026-05-28 21:32 – Updated: 2026-05-28 21:32

Details

An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.

Severity

6.0 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43000"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T19:16:37Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim\u0027s identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim\u0027s actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim\u0027s admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim\u0027s identity.",
  "id": "GHSA-q623-f4j4-p4xj",
  "modified": "2026-05-28T21:32:02Z",
  "published": "2026-05-28T21:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43000"
    },
    {
      "type": "WEB",
      "url": "https://bugs.launchpad.net/keystone/+bug/2148477"
    },
    {
      "type": "WEB",
      "url": "https://security.openstack.org/ossa/OSSA-2026-015.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43000 (GCVE-0-2026-43000)

Vulnerability from cvelistv5 – Published: 2026-05-28 00:00 – Updated: 2026-05-28 19:41

Summary

Severity

6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-863 - Incorrect Authorization

Assigner

mitre

References

2 references

URL	Tags
https://bugs.launchpad.net/keystone/+bug/2148477
https://security.openstack.org/ossa/OSSA-2026-015.html

Impacted products

1 product

Vendor	Product	Version
OpenStack	Keystone	Affected: 14.0.0 , < 27.0.2 (semver) Affected: 28.0.0 , < 28.0.2 (semver) Affected: 29.0.0 , < 29.0.2 (semver)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-43000",
                "options": [
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T19:41:32.071988Z",
                "version": "2.0.3"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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              "version": "29.0.0",
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            "attackVector": "NETWORK",
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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

GHSA-Q623-F4J4-P4XJ

CVE-2026-43000 (GCVE-0-2026-43000)

Tags

Sightings

Nomenclature