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CVE-2026-73427— Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)

Quick assessment

Affected
basecamp trix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

37signals Trix是37signals组织开源的一个适用于日常写作的丰富文本编辑器。 37signals Trix 2.1.18之前版本存在跨站脚本漏洞，该漏洞源于StringPiece.fromJSON方法信任JSON负载中的href属性而未进行清理，导致包含javascript: URI的可拖动元素可绕过DOMPurify清理并注入可执行JavaScript，造成跨站脚本攻击。

CVSS 2.1 · Low EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
basecamp trix < 2.1.18 affected
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I. Basic Information for CVE-2026-73427

Vulnerability Information
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Vulnerability Title
Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
37signals Trix 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
37signals Trix是37signals组织开源的一个适用于日常写作的丰富文本编辑器。 37signals Trix 2.1.18之前版本存在跨站脚本漏洞，该漏洞源于StringPiece.fromJSON方法信任JSON负载中的href属性而未进行清理，导致包含javascript: URI的可拖动元素可绕过DOMPurify清理并注入可执行JavaScript，造成跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
basecamp trix < 2.1.18 -

II. Public POCs for CVE-2026-73427

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III. Intelligence Information for CVE-2026-73427

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Patches & Fixes for CVE-2026-73427 (2)

Vendor Advisories for CVE-2026-73427 (1)

Vendor Pages for CVE-2026-73427 (1)

IV. Related Vulnerabilities

Same product: trix
Same vendor: basecamp
Same weakness: CWE-79

V. Comments for CVE-2026-73427

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