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: 0.4% (26th percentile of EPSS-scored CVEs). 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: 0.4%CVSS: 4.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
4.6MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 24, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
Patch available. Sources: github_pr, github_release, github, github_commit.
githubMentions a patch (unverified)

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 rangeFix by version rangeDependents
trix—
  • every version up to 2.1.18: fixed in 2.1.18
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
action_text-trix0.0.1, 2.1.15, 2.1.16, 2.1.17
  • every version up to 2.1.18: fixed in 2.1.18
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× 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. 2026-10-06 15:18 UTCEPSS rescore
  2. 2026-10-05 17:43 UTCEPSS rescore
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 07:42 UTCEG score recompute
  5. 2026-10-03 14:26 UTCEPSS rescore
  6. 2026-10-03 03:18 UTCEG score recompute
  7. 2026-10-01 19:50 UTCEPSS rescore
  8. 2026-10-01 05:59 UTCEG score recompute
  9. 2026-09-29 15:24 UTCEPSS rescore
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-28 04:27 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 10:07 UTCEG score recompute
  15. 2026-09-24 00:56 UTCEG score recompute
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-22 22:13 UTCEG score recompute
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 01:39 UTCEG score recompute
  21. 2026-09-18 20:35 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-18 02:59 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 11:59 UTCEG score recompute
Show 55 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 09:36 UTCEG score recompute
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-13 17:47 UTCEG score recompute
  5. 2026-09-12 17:12 UTCEG score recompute
  6. 2026-09-12 15:02 UTCEPSS rescore
  7. 2026-09-11 16:36 UTCEG score recompute
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 13:36 UTCEG score recompute
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-09 08:45 UTCEG score recompute
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-07 21:24 UTCEG score recompute
  14. 2026-09-06 13:48 UTCEPSS rescore
  15. 2026-09-05 19:23 UTCEG score recompute
  16. 2026-09-04 12:51 UTCEG score recompute
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 23:16 UTCEG score recompute
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-08-31 00:52 UTCEG score recompute
  24. 2026-08-30 19:18 UTCEPSS rescore
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 00:17 UTCEG score recompute
  27. 2026-08-28 21:42 UTCEPSS rescore
  28. 2026-08-28 02:26 UTCEG score recompute
  29. 2026-08-27 14:25 UTCEPSS rescore
  30. 2026-08-27 01:50 UTCEG score recompute
  31. 2026-08-26 14:47 UTCEPSS rescore
  32. 2026-08-26 01:16 UTCEG score recompute
  33. 2026-08-25 13:49 UTCEPSS rescore
  34. 2026-08-25 00:41 UTCEG score recompute
  35. 2026-08-24 00:03 UTCEG score recompute
  36. 2026-08-23 00:19 UTCEPSS rescore
  37. 2026-08-22 23:29 UTCEG score recompute
  38. 2026-08-21 23:49 UTCEPSS rescore
  39. 2026-08-21 22:54 UTCEG score recompute
  40. 2026-08-20 22:56 UTCEPSS rescore
  41. 2026-08-19 21:44 UTCEG score recompute
  42. 2026-08-19 17:04 UTCEPSS rescore
  43. 2026-08-18 20:56 UTCEG score recompute
  44. 2026-08-18 13:49 UTCEPSS rescore
  45. 2026-08-18 13:49 UTCEPSS rescore
  46. 2026-08-17 20:22 UTCEG score recompute
  47. 2026-08-17 13:47 UTCEPSS rescore
  48. 2026-08-16 19:48 UTCEG score recompute
  49. 2026-08-16 14:56 UTCEPSS rescore
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 02:15 UTCEPSS rescore
  52. 2026-08-15 19:14 UTCEG score recompute
  53. 2026-08-15 01:31 UTCEPSS rescore
  54. 2026-08-13 22:25 UTCEG score recompute
  55. 2026-08-12 21:21 UTCEG score recompute

Related CVEs(same product + 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 on July 24, 2026, with the most recent update on September 18, 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 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73428?
CVE-2026-73428 has a CVSS base score of 4.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73428?
A fix for CVE-2026-73428 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73428 are linked in the Vendor Advisories panel on this page.

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