---
cve: "CVE-2026-73428"
severity: "MEDIUM"
cvss: 4.6
epss: "0.2%"
vendor: "basecamp"
kev: false
exploited: false
published: "2026-08-13 22:17:26"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T02:16:14+02:00"
---

# CVE-2026-73428

> 4.6 MEDIUM · 🧪 PoC

## Beschreibung

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 `` 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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 9c0a993d9fc2ffe9d56b013b030bc238f9c0557c (Commit)
- da8869922e19bc3f852091468d34029af80813e7 (Commit)

## Referenzen

- <https://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3>
- <https://github.com/basecamp/trix/pull/1293>
- <https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c>
- <https://github.com/basecamp/trix/releases/tag/v2.1.18>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73428) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_