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CVE-2026-73428— Trix: Stored XSS via HTMLParser attribute injection on paste

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，该漏洞源于未验证的href参数，可能导致存储型跨站脚本攻击。

CVSS 4.6 · Medium EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
basecamp trix < 2.1.18 affected
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I. Basic Information for CVE-2026-73428

Vulnerability Information
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Vulnerability Title
Trix: Stored XSS via HTMLParser attribute injection on paste
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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A: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，该漏洞源于未验证的href参数，可能导致存储型跨站脚本攻击。
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-2026-73428

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III. Intelligence Information for CVE-2026-73428

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Patches & Fixes for CVE-2026-73428 (2)

Vendor Advisories for CVE-2026-73428 (1)

Vendor Pages for CVE-2026-73428 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-73428

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