CVE-2026-73426

Trix: Stored XSS vulnerability through serialized attributes

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.17, Trix is vulnerable to cross-site scripting when a data-trix-serialized-attributes attribute bypasses the DOMPurify sanitizer. An attacker can craft HTML containing a data-trix-serialized-attributes attribute with a malicious payload that, when rendered, executes arbitrary JavaScript in the user's session and may perform unauthorized actions or disclose sensitive information. This issue is fixed in version 2.1.17.

CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2026-73428

Trix: Stored XSS via HTMLParser attribute injection on paste

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor. HTMLParser processes a mock attachment in a `<span>` with an empty `data-trix-attachment="{}"` value, causing data-trix-attributes to be applied to a plain string piece. StringPiece.fromJSON accepts an unvalidated href, allowing a javascript: URI to enter the document model and serialized HTML and execute when another user renders and clicks the content. Applications that apply server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.

CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2026-73427

Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to cross-site scripting when a crafted application/x-trix-document JSON payload is dropped into an editor using the fallback Level0InputController, such as an embedded WebView without Input Events Level 2 support. The StringPiece.fromJSON method trusts href attributes from the JSON payload without sanitization, allowing a draggable element containing a javascript: URI to bypass DOMPurify sanitization and inject executable JavaScript into the DOM. Exploitation requires the victim to drag and drop attacker-controlled content, and server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2025-21610

Trix allows Cross-site Scripting via `javascript:` url in a link

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Versions prior to 2.1.12 are vulnerable to cross-site scripting when pasting malicious code in the link field. An attacker could trick the user to copy&paste a malicious `javascript:` URL as a link that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. Users should upgrade to Trix editor version 2.1.12 or later to receive a patch. In addition to upgrading, affected users can disallow browsers that don't support a Content Security Policy (CSP) as a workaround for this and other cross-site scripting vulnerabilities. Set CSP policies such as script-src 'self' to ensure that only scripts hosted on the same origin are executed, and explicitly prohibit inline scripts using script-src-elem.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2024-34341

The Trix Editor Contains an Arbitrary Code Execution Vulnerability

Trix is a rich text editor. The Trix editor, versions prior to 2.1.1, is vulnerable to arbitrary code execution when copying and pasting content from the web or other documents with markup into the editor. The vulnerability stems from improper sanitization of pasted content, allowing an attacker to embed malicious scripts which are executed within the context of the application. Users should upgrade to Trix editor version 2.1.1 or later, which incorporates proper sanitization of input from copied content.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2025-46812

Trix vulnerable to Cross-site Scripting on copy & paste

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Versions prior to 2.1.15 are vulnerable to XSS attacks when pasting malicious code. An attacker could trick a user to copy and paste malicious code that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. This issue has been patched in version 2.1.15.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2024-43368

Trix has a Cross-Site Scripting (XSS) vulnerability on copy & paste

The Trix editor, versions prior to 2.1.4, is vulnerable to XSS when pasting malicious code. This vulnerability is a bypass of the fix put in place for GHSA-qjqp-xr96-cj99. In pull request 1149, sanitation was added for Trix attachments with a `text/html` content type. However, Trix only checks the content type on the paste event's `dataTransfer` object. As long as the `dataTransfer` has a content type of `text/html`, Trix parses its contents and creates an `Attachment` with them, even if the attachment itself doesn't have a `text/html` content type. Trix then uses the attachment content to set the attachment element's `innerHTML`. An attacker could trick a user to copy and paste malicious code that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. This vulnerability was fixed in version 2.1.4.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix

CVE-2024-53847

Trix vulnerable to Cross-site Scripting on copy & paste

The Trix rich text editor, prior to versions 2.1.9 and 1.3.3, is vulnerable to cross-site scripting (XSS) + mutation XSS attacks when pasting malicious code. An attacker could trick a user to copy and paste malicious code that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. Users should upgrade to Trix editor version 2.1.9 or 1.3.3, which uses DOMPurify to sanitize the pasted content.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed

Vendors

Basecamp

Products

Trix