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CVE-2026-43000 medium CVSS 6.0

Vulnerability in keystone (CVE-2026-43000)

Summary

Vulnerability in keystone (CVE-2026-43000). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 29.0.2 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-43000 has been found in keystone.
Risk of unauthorized operations or information disclosure. CVSS score: 6.0/10.
What to do: upgrade keystone to 29.0.2 or later.
If unsure, ask your IT team or search "keystone CVE-2026-43000" on the vendor's site.

CVE-2026-43000 (keystone) — CWE-266 / CVSS v3 6.0
Attack vector: remote (network-reachable) / no user interaction
Patched: 29.0.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-266) exists in keystone.

📍 Affected scope

Check the vendor advisory for the affected versions of keystone.

🔥 Severity

Severity: Medium (CVSS 6.0/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 29.0.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'keystone' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'keystone' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で keystone を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade keystone to 29.0.2

    ステージング環境で 29.0.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip keystone
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"29.0.2"}]}]
PyPI keystone
[{"type":"ECOSYSTEM","events":[{"introduced":"29.0.0"},{"fixed":"29.0.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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