{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-115938", "assignerOrgId": "7004884b-51e2-48e8-b4a2-5ca29e80453e", "state": "PUBLISHED", "assignerShortName": "Hackrate", "dateReserved": "2026-10-23T21:25:32.945Z", "datePublished": "2026-10-23T21:58:51.816Z", "dateUpdated": "2026-10-23T21:58:51.816Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "7004884b-51e2-48e8-b4a2-5ca29e80453e", "shortName": "Hackrate", "dateUpdated": "2026-10-23T21:58:51.816Z" }, "title": "Low privilege condition filter escapes Twig sandbox, recovers \"securityKey\" and reaches RCE", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-1336", "description": "CWE-1336 Improper neutralization of special elements used in a template engine", "type": "CWE" } ] } ], "affected": [ { "vendor": "craftcms", "product": "cms", "collectionURL": "https://packagist.org", "packageName": "craftcms/cms", "versions": [ { "status": "affected", "version": "5.0.0", "lessThan": "5.11.2", "versionType": "semver" }, { "status": "affected", "version": "4.0.0", "lessThan": "4.18.9", "versionType": "semver" } ], "defaultStatus": "unaffected" } ], "cpeApplicability": [ { "operator": "OR", "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0", "versionEndExcluding": "5.11.2" }, { "vulnerable": true, "criteria": "cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0.0", "versionEndExcluding": "4.18.9" } ] } ] } ], "descriptions": [ { "lang": "en", "value": "Craft CMS allows any authenticated control panel user to submit an element-search condition whose element selector is evaluated as a sandboxed Twig object template. Craft’s allowed column filter delegates property lookup to Yii ArrayHelper, outside Twig’s SecurityPolicy. Repeated single-segment lookups therefore bypass the sandbox’s empty property/method allowlists.\n\n\n\nThe vulnerable condition value is ultimately cast to an integer. That does not protect the secret: the template can return author ID 1 when a guessed key character is correct and an impossible ID otherwise. The JSON endpoint returns entries for the first case and an empty array for the second, forming a stable remote character oracle.\n\n\n\nAfter recovering GeneralConfig::securityKey, the same user can compute Craft’s generic HMAC wire format offline. Signed parameters such as redirect are then accepted and passed to unsandboxed View::renderObjectTemplate(), where Twig’s string-callable form can invoke native PHP callables. The regression proof uses the harmless substr() callback and observes abcdef becoming cdef; it does not execute an OS command.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

Craft CMS allows any authenticated control panel user to submit an element-search condition whose element selector is evaluated as a sandboxed Twig object template. Craft’s allowed column filter delegates property lookup to Yii ArrayHelper, outside Twig’s SecurityPolicy. Repeated single-segment lookups therefore bypass the sandbox’s empty property/method allowlists.

The vulnerable condition value is ultimately cast to an integer. That does not protect the secret: the template can return author ID 1 when a guessed key character is correct and an impossible ID otherwise. The JSON endpoint returns entries for the first case and an empty array for the second, forming a stable remote character oracle.

After recovering GeneralConfig::securityKey, the same user can compute Craft’s generic HMAC wire format offline. Signed parameters such as redirect are then accepted and passed to unsandboxed View::renderObjectTemplate(), where Twig’s string-callable form can invoke native PHP callables. The regression proof uses the harmless substr() callback and observes abcdef becoming cdef; it does not execute an OS command.

" } ] } ], "references": [ { "url": "https://www.hckrt.com/hacktivity/HCKRT-DRNL9W", "tags": [ "third-party-advisory", "technical-description", "mitigation" ] }, { "url": "https://github.com/craftcms/cms/releases/tag/5.11.2", "tags": [ "release-notes" ] }, { "url": "https://github.com/craftcms/cms", "tags": [ "product" ] }, { "url": "https://github.com/craftcms/cms/security/advisories/GHSA-v4q3-2g5g-wjj6", "tags": [ "third-party-advisory" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } } ], "credits": [ { "lang": "en", "value": "Mohamed Wagdy (@Kalawy)", "type": "reporter" }, { "lang": "en", "value": "Hackrate", "type": "coordinator" } ], "source": { "advisory": "GHSA-v4q3-2g5g-wjj6", "discovery": "UNKNOWN" }, "x_generator": { "engine": "Vulnogram 1.0.4" } } } }