2.1

CVE-2026-73427: basecamp trix Cross-site Scripting

CVSS: 2.1v4.0LowDeferred
AliasesCGA-39h4-4833-xqx9CGA-5j73-h4mq-v7hcCGA-5vg7-4h86-m5rh
Published 12-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-73427 is a low (CVSS 2.1) Cross-site Scripting vulnerability in basecamp trix. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.6% of scored vulnerabilities.

Overall risk
9/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.1/10
010
Low · v4.0 (CVE.org)
EPSS score
0.57%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-CWGR-GRWC-8WGX

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.25 pp

From 0.33% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard4 products
  • ruby3.2-rails-8.1< 8.1.3-r1
  • ruby3.3-rails-8.1< 8.1.3-r1
  • ruby3.4-rails-8.1< 8.1.3-r1
  • ruby4.0-rails-8.1< 8.1.3-r1
Wolfi4 products
  • ruby3.2-rails-8.1< 8.1.3-r1
  • ruby3.3-rails-8.1< 8.1.3-r1
  • ruby3.4-rails-8.1< 8.1.3-r1
  • ruby4.0-rails-8.1< 8.1.3-r1
Basecamp1 product
Npm1 product
  • trix< 2.1.18
RubyGems1 product
  • action_text-trix< 2.1.18

5 vendors · 11 products

References

8 links