CVE-2026-33159

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From version 4.0.0-RC1 to before version 4.17.8 and from version 5.0.0-RC1 to before version 5.9.14, guest users can access Config Sync updater index, obtain signed data, and execute state-changing Config Sync actions (regenerate-yaml, apply-yaml-changes) without authentication. This issue has been patched in versions 4.17.8 and 5.9.14."}, {"lang": "es", "value": "Craft CMS es un sistema de gesti\u00f3n de contenido (CMS). Desde la versi\u00f3n 4.0.0-RC1 hasta antes de la versi\u00f3n 4.17.8 y desde la versi\u00f3n 5.0.0-RC1 hasta antes de la versi\u00f3n 5.9.14, los usuarios invitados pueden acceder al \u00edndice del actualizador de Config Sync, obtener datos firmados y ejecutar acciones de Config Sync que cambian el estado (regenerate-yaml, apply-yaml-changes) sin autenticaci\u00f3n. Este problema ha sido parcheado en las versiones 4.17.8 y 5.9.14."}], "id": "CVE-2026-33159", "lastModified": "2026-06-17T10:37:03.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33159", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-24T17:57:07.569945Z", "version": "2.0.3"}}]}, "published": "2026-03-24T18:16:09.907", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/craftcms/cms/commit/7f0ead833f7c2b91ae12003caad833479dd08592"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/craftcms/cms/releases/tag/4.17.8"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/craftcms/cms/releases/tag/5.9.14"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/craftcms/cms/security/advisories/GHSA-6mrr-q3pj-h53w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-862"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0-RC1,4.17.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-RC1,5.9.14)"}}], "enrichment": {"confidence": 83.0, "confidence_source": "matching", "scores": [{"score": 83.0, "source": "matching"}]}, "original": {"product": "cms", "source": "cna", "vendor": "craftcms"}, "product": "craftcms", "vendor": "craftcms"}], "analysis": {"en": {"generated_at": "2026-03-26T18:59:38.675893+00:00", "value": {"mitigation_remediation": ["Upgrade Craft CMS to 4.17.8 or later, or to 5.9.14 or later, depending on your version branch.", "If an immediate upgrade is not feasible, block external access to the Config Sync endpoints (for example /admin/config-sync) using a web\u2011application firewall or server\u2011level access rules.", "After the upgrade or blocking, verify that the Config Sync actions are no longer available to unauthenticated users by attempting to access the updater index and confirming that authentication is required."], "summary": {"action": "Immediate Patch", "impact": "Unauthorized configuration modification"}, "threat_synthesis": {"affected_systems": "The affected product is Craft CMS from the vendor Craft CMS. The vulnerability applies to all releases in the 4.x line starting at 4.0.0\u2011RC1 up to, but not including, 4.17.8, and to the 5.x line starting at 5.0.0\u2011RC1 up to, but not including, 5.9.14. Any installation of these versions that has the configuration sync feature enabled is susceptible.", "description_and_impact": "Craft CMS versions 4.x before 4.17.8 and 5.x before 5.9.14 allow unauthenticated guest users to access the configuration\u2011sync updater. By visiting the updater index they can retrieve signed data and invoke state\u2011changing actions such as regenerate\u2011yaml and apply\u2011yaml\u2011changes. This results in unauthorized modification of the site\u2019s configuration settings, potentially altering functionality, security\u2011related options or even exposed data. The weakness is a lack of an authentication check for these privileged operations (CWE\u2011306) and a failure to enforce role\u2011based permissions (CWE\u2011862).", "risk_and_exploitability": "The CVSS v3.1 base score is 6.9, indicating a moderate severity that could lead to configuration tampering. The EPSS score is reported as less than 1\u202f%, suggesting that the likelihood of exploitation observed in the wild is currently low, and the vulnerability is not listed in CISA\u2019s KEV catalog. The likely attack vector is remote, performed through the website\u2019s publicly accessible HTTP/HTTPS interface, where an attacker can send crafted requests to the config\u2011sync endpoints. Exploitation requires no prior authentication, only knowledge of the endpoint URLs, making it straightforward for an unauthenticated user to trigger the permitted actions."}}}}, "created": "2026-03-25T11:46:59.522308+00:00", "updated": "2026-03-27T09:20:56.680156+00:00", "vendors": ["craftcms", "craftcms$PRODUCT$craftcms"]}