{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/suneditor-3.1.3/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"id":"CVE-2026-54606"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["suneditor (3.1.3)"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["SunEditor"],"content_html":"\u003cp\u003eA DOM-based Cross-Site Scripting (XSS) vulnerability (CVE-2026-54606) affects the SunEditor Embed plugin in versions 3.1.3 and earlier. The vulnerability arises from improper handling of user-supplied HTML within the Embed plugin. When the plugin processes raw embed HTML, it parses the content and identifies DOM nodes. Specifically, the plugin logic fails to adequately validate or discard sibling \u003ccode\u003e\u0026lt;script\u0026gt;\u003c/code\u003e elements that follow an \u003ccode\u003e\u0026lt;iframe\u0026gt;\u003c/code\u003e. Instead, it explicitly recreates these script elements using an attacker-controlled \u003ccode\u003esrc\u003c/code\u003e attribute and appends them to the live DOM. This process effectively bypasses existing sanitization mechanisms, causing the browser to execute the referenced external JavaScript in the security context of the editor page. This issue is particularly dangerous in applications where SunEditor content is persisted in a backend and later rendered for other users or administrators, facilitating stored XSS attacks.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker prepares an external malicious JavaScript file and hosts it on a server under their control.\u003c/li\u003e\n\u003cli\u003eThe attacker gains access to the SunEditor interface, either as a legitimate user or through an application-level injection vector.\u003c/li\u003e\n\u003cli\u003eThe attacker utilizes the SunEditor Embed modal to submit a crafted HTML payload containing a legitimate iframe followed by the malicious script tag.\u003c/li\u003e\n\u003cli\u003eThe application saves the malicious payload into the backend database.\u003c/li\u003e\n\u003cli\u003eA victim, such as an administrator, opens the SunEditor instance to edit or preview the stored content.\u003c/li\u003e\n\u003cli\u003eThe Embed plugin parses the stored content, extracts the script element, and recreates the node with the attacker's \u003ccode\u003esrc\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe plugin appends the malicious script node to the document body.\u003c/li\u003e\n\u003cli\u003eThe victim's browser executes the external JavaScript, resulting in session hijacking, data exfiltration, or UI manipulation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows for arbitrary JavaScript execution within the context of the user's session. This could lead to account takeover, unauthorized actions performed as the victim, theft of session tokens or sensitive data, and the modification of editor content. The impact is elevated in multi-user environments where content is shared or reviewed by privileged users.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eUpgrade SunEditor to a patched version that resolves CVE-2026-54606.\u003c/li\u003e\n\u003cli\u003eIf patching is not immediately feasible, implement the suggested fix to explicitly discard \u003ccode\u003escript\u003c/code\u003e elements during the parsing phase of the Embed plugin.\u003c/li\u003e\n\u003cli\u003eImplement strict Content Security Policy (CSP) headers on the host application to prevent the execution of scripts from unauthorized or untrusted domains.\u003c/li\u003e\n\u003cli\u003eSanitize all stored content on the backend before rendering it in the browser to prevent stored XSS.\u003c/li\u003e\n\u003c/ol\u003e\n","date_modified":"2026-08-26T20:21:04Z","date_published":"2026-08-26T20:21:04Z","id":"https://feed.craftedsignal.io/briefs/2026-08-suneditor-xss/","summary":"The SunEditor Embed plugin contains a DOM-based Cross-Site Scripting (XSS) vulnerability (CVE-2026-54606) where unsanitized script elements appended to the DOM allow for arbitrary JavaScript execution.","title":"DOM-based XSS in SunEditor Embed Plugin","url":"https://feed.craftedsignal.io/briefs/2026-08-suneditor-xss/"}],"language":"en","title":"CraftedSignal Threat Feed - Suneditor (3.1.3)","version":"https://jsonfeed.org/version/1.1"}