Answer in brief
CVE-2026-73428 records a Medium severity (CVSS 4.6) vulnerability in Trix: Stored XSS via HTMLParser attribute injection on paste. The current sources do not mark it as known exploited. The current feed maps basecamp/trix (generic), trix (npm), trix (npm), action_text-trix (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps basecamp/trix (generic), trix (npm), trix (npm), action_text-trix (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| basecamp/trixgeneric | < 2.1.18 | Not reported |
| trixnpm | >=0 <2.1.18 | 2.1.18 |
| trixnpm | <2.1.18 | 2.1.18 |
| action_text-trixrubygems | >=0 <2.1.18 | 2.1.18 |
| action_text-trixrubygems | <2.1.18 | 2.1.18 |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-73428 records a Medium severity (CVSS 4.6) vulnerability in Trix: Stored XSS via HTMLParser attribute injection on paste. The current sources do not mark it as known exploited. The current feed maps basecamp/trix (generic), trix (npm), trix (npm), action_text-trix (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps basecamp/trix (generic), trix (npm), trix (npm), action_text-trix (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| basecamp/trixgeneric | < 2.1.18 | Not reported |
| trixnpm | >=0 <2.1.18 | 2.1.18 |
| trixnpm | <2.1.18 | 2.1.18 |
| action_text-trixrubygems | >=0 <2.1.18 | 2.1.18 |
| action_text-trixrubygems | <2.1.18 | 2.1.18 |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
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.
Quoted source text, attributed separately from HOL analysis.