{"id":"CVE-2026-46396","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-46396","summary":"Stored XSS via <iframe> in HAX CMS allows access to sensitive client-side data and account takeover","details":"### Summary\nA stored cross-site scripting (XSS) vulnerability exists in HAX CMS due to improper sanitization of `<iframe>` elements.\n\nThe application allows `javascript:` URIs in the `src` attribute, which are executed when a malicious page is viewed. This enables attackers to execute arbitrary JavaScript in the context of the victim’s browser and access sensitive data exposed to client-side scripts.\n\n### Details\nSuccessful exploitation allows access to any data available in the browser context, including:\n\n- Authentication tokens (e.g., JWT)\n- Session cookies (if not protected with HttpOnly)\n- Application configuration (e.g., window.appSettings)\n- User-specific data accessible via APIs\n\nThis significantly increases the impact beyond simple script execution.\n\n### PoC\nSteps to reproduce:\n\n1. Log in to HAX CMS as any authenticated user.\n2. Create a new page or edit an existing page.\n3. Open the HTML source editor (`<>`).\n4. Insert the following payload:\n\n```html\n<iframe srcdoc=\"&lt;script&gt;\n    (function(){\n        try {\n            var jwt = parent.window.appSettings.jwt;\n            alert('Stolen JWT:\\n' + jwt);\n        } catch(e) {\n            alert('Error: ' + e.message);\n        }\n    })();\n&lt;/script&gt;\" style=\"display:none\" sandbox=\"allow-scripts allow-same-origin\"></iframe>\n```\n<img width=\"2446\" height=\"1319\" alt=\"image\" src=\"https://github.com/user-attachments/assets/daea3b41-8c72-4f6c-ab32-34c688bbd251\" />\n\n\n<img width=\"2464\" height=\"1397\" alt=\"image\" src=\"https://github.com/user-attachments/assets/911cbd42-db50-454a-b178-51555e0db79c\" />\n\n\n\n<img width=\"2466\" height=\"1409\" alt=\"webhook`\" src=\"https://github.com/user-attachments/assets/8a286435-98f4-418c-a596-d0c19556696a\" />\n\n### Impact\nThis vulnerability allows stored XSS leading to:\n\n- Execution of arbitrary JavaScript in victim browsers\n- Access to sensitive client-side data, including authentication tokens and session identifiers\n- Unauthorized API actions performed on behalf of the victim\n- Session hijacking and full account takeover\n\nBecause the application exposes authentication data in the client-side environment, exploitation of this vulnerability can lead to complete compromise of user accounts and site content.","published":"2026-05-19T14:46:47Z","modified":"2026-06-09T12:00:14.216587769Z","cvss":null,"epss":{"score":0.0023,"percentile":0.13832,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@haxtheweb/haxcms-nodejs","fixedVersion":"26.0.0"},{"ecosystem":"npm","name":"@haxtheweb/video-player","fixedVersion":"26.0.0"},{"ecosystem":"npm","name":"@haxtheweb/iframe-loader","fixedVersion":"26.0.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/haxtheweb/issues/security/advisories/GHSA-jh3h-rpxg-fr36"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46396"},{"type":"PACKAGE","url":"https://github.com/haxtheweb/issues"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-06-09T12:00:14.216587769Z"}}