CVE-2026-23885

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{"affected": [{"affectedData": [{"product": "alchemy_cms", "vendor": "AlchemyCMS", "versions": [{"status": "affected", "version": "< 7.4.12"}, {"status": "affected", "version": ">= 8.0.0.a, < 8.0.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:alchemy-cms:alchemy_cms:*:*:*:*:*:*:*:*", "matchCriteriaId": "6F247A42-8A2A-4EB9-98D9-6D29401B36FF", "versionEndExcluding": "7.4.12", "vulnerable": true}, {"criteria": "cpe:2.3:a:alchemy-cms:alchemy_cms:*:*:*:*:*:*:*:*", "matchCriteriaId": "7950D68F-3FA8-4C37-8AC4-0F0D8D5B9110", "versionEndExcluding": "8.0.3", "versionStartIncluding": "8.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Alchemy is an open source content management system engine written in Ruby on Rails. Prior to versions 7.4.12 and 8.0.3, the application uses the Ruby `eval()` function to dynamically execute a string provided by the `resource_handler.engine_name` attribute in `Alchemy::ResourcesHelper#resource_url_proxy`. The vulnerability exists in `app/helpers/alchemy/resources_helper.rb` at line 28. The code explicitly bypasses security linting with `# rubocop:disable Security/Eval`, indicating that the use of a dangerous function was known but not properly mitigated. Since `engine_name` is sourced from module definitions that can be influenced by administrative configurations, it allows an authenticated attacker to escape the Ruby sandbox and execute arbitrary system commands on the host OS. Versions 7.4.12 and 8.0.3 fix the issue by replacing `eval()` with `send()`."}, {"lang": "es", "value": "Alchemy es un motor de sistema de gesti\u00f3n de contenido de c\u00f3digo abierto escrito en Ruby on Rails. Antes de las versiones 7.4.12 y 8.0.3, la aplicaci\u00f3n utiliza la funci\u00f3n `eval()` de Ruby para ejecutar din\u00e1micamente una cadena proporcionada por el atributo `resource_handler.engine_name` en `Alchemy::ResourcesHelper#resource_url_proxy`. La vulnerabilidad existe en `app/helpers/alchemy/resources_helper.rb` en la l\u00ednea 28. El c\u00f3digo omite expl\u00edcitamente el an\u00e1lisis de seguridad con `# rubocop:disable Security/Eval`, indicando que el uso de una funci\u00f3n peligrosa era conocido pero no mitigado adecuadamente. Dado que `engine_name` se obtiene de definiciones de m\u00f3dulos que pueden ser influenciadas por configuraciones de administraci\u00f3n, permite a un atacante autenticado escapar de la sandbox de Ruby y ejecutar comandos de sistema arbitrarios en el sistema operativo anfitri\u00f3n. Las versiones 7.4.12 y 8.0.3 solucionan el problema reemplazando `eval()` por `send()`."}], "id": "CVE-2026-23885", "lastModified": "2026-06-17T10:22:15.387", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.5, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23885", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-21T21:08:44.539151Z", "version": "2.0.3"}}]}, "published": "2026-01-19T22:16:02.453", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/AlchemyCMS/alchemy_cms/commit/55d03ec600fd9e07faae1138b923790028917d26"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/AlchemyCMS/alchemy_cms/commit/563c4ce45bf5813b7823bf3403ca1fc32cb769e7"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.12"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.3"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-2762-657x-v979"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-95"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T04:56:54.482918+00:00", "value": {"mitigation_remediation": ["Upgrade AlchemyCMS to at least version 7.4.12 or 8.0.3 to replace eval() with send()", "Verify that the resource_handler.engine_name attribute cannot be manipulated by non-administrative users or external input", "Restrict administrative access and enforce least-privilege principles to prevent unauthorized use of the CMS's editor features"], "summary": {"action": "Patch Now", "impact": "Authenticated Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Affected systems are the AlchemyCMS engine provided by AlchemyCMS. Versions prior to 7.4.12 and 8.0.3 contain the flaw. After applying the updates that replace eval() with the safer send() method, the vulnerability is remedied.", "description_and_impact": "The vulnerability originates from the use of Ruby's eval() function in AlchemyCMS's ResourcesHelper, which processes a string from the resource_handler.engine_name attribute without proper validation. An attacker who can authenticate with administrative privileges can supply malicious code through engine_name, enabling arbitrary system command execution. This flaw falls under the injection category of CWE-95, allowing attackers to compromise the host operating system and all data stored on it.", "risk_and_exploitability": "The CVSS score of 6.4 classifies the flaw as moderate severity, but the impact of remote code execution elevates its operational risk. The EPSS score of less than 1% indicates a low probability of widespread exploitation in the wild, and the flaw is not currently listed in the CISA KEV catalog. Nonetheless, only users who have administrative access to the CMS can trigger the vulnerability, so the attack surface is limited to authenticated privileged accounts. Effective patching and strict role separation are essential to mitigate the risk."}}}}, "created": "2026-01-20T08:40:35.641952+00:00", "updated": "2026-04-18T05:00:06.038794+00:00", "vendors": ["alchemy-cms", "alchemy-cms$PRODUCT$alchemy_cms"]}