CVE-2026-73428

MEDIUMPre-NVD 4.64.6—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
4.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.6
EG Score
4.6(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity46% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 14, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available

Stored XSS via HTMLParser attribute injection on paste · Advisory · basecamp/trix · GitHub

https://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3
github_release Patch Available

v2.1.18

Patch available: basecamp/trix v2.1.18

https://github.com/basecamp/trix/releases/tag/v2.1.18
github_pr Patch Available

Sanitize javascript: URI in JSON drag-drop deserialization

Patch available: basecamp/trix v2.1.18 (PR #1293 merged 2026-03-26)

https://github.com/basecamp/trix/pull/1293
github_commit Patch Available

commit 9c0a993d9fc2 (basecamp/trix)

Patch available: basecamp/trix v2.1.18 (contains commit 9c0a993d9fc2)

https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c

Vendor Advisories for CVE-2026-73428(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
npm(1)
PackageVulnerable rangeFixed inDependents
trix—2.1.18—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
action_text-trix0.0.1, 2.1.15, 2.1.16, 2.1.172.1.18—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-22 23:29 UTCEG score recompute
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 22:54 UTCEG score recompute
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-19 21:44 UTCEG score recompute
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-18 20:56 UTCEG score recompute
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-17 20:22 UTCEG score recompute
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 19:48 UTCEG score recompute
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:15 UTCEPSS rescore
  17. 2026-08-15 19:14 UTCEG score recompute
  18. 2026-08-15 01:31 UTCEPSS rescore
  19. 2026-08-13 22:25 UTCEG score recompute
  20. 2026-08-12 21:21 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73428?
CVE-2026-73428 is a medium vulnerability published on July 24, 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…
When was CVE-2026-73428 disclosed?
CVE-2026-73428 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73428 actively exploited?
CVE-2026-73428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.1% of all scored CVEs.
What is the CVSS score of CVE-2026-73428?
CVE-2026-73428 has a CVSS v3 base score of 4.6 (NVD).
How do I remediate CVE-2026-73428?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73428, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-73428

Explore →

Is Your Infrastructure Affected by CVE-2026-73428?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs