CVE-2026-90561

HIGHPre-NVD 8.78.7—
EchelonGraph scoreHIGH confidence

Score 8.7 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-13. a secondary CVSS source baseline 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an Editor or Super Admin's session when the preview pane is expanded, enabling account takeover.

CVSS v3
8.7
EG Score
8.7(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

September 13, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Sep 13, 2026
Patch available. Sources: github_commit.
generic

Strapi 4.x through 4.26.2 and 5.x before 5.48.1 Stored XSS via WYSIWYG | Advisories | VulnCheck

https://www.vulncheck.com/advisories/strapi-4-x-through-4.26.2-and-5-x-before-5.48.1-stored-xss-via-wysiwyg
github_commit Patch Available

commit 875752612c30 (strapi/strapi)

Patch available: strapi/strapi v5.48.1 (contains commit 875752612c30)

https://github.com/strapi/strapi/commit/875752612c30f951546904a29469e51e17e0ac37
generic

strapi/packages/core/content-manager/admin/src/pages/EditView/components/FormInputs/Wysiwyg/PreviewWysiwyg.tsx at v5.46.0 · strapi/strapi · GitHub

https://github.com/strapi/strapi/blob/v5.46.0/packages/core/content-manager/admin/src/pages/EditView/components/FormInputs/Wysiwyg/PreviewWysiwyg.tsx
generic

GitHub - strapi/strapi: 🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first. · GitHub

https://github.com/strapi/strapi
generic

Stored XSS via WYSIWYG Rich Text Preview · Issue #26857 · strapi/strapi · GitHub

https://github.com/strapi/strapi/issues/26857

Vendor Advisories for CVE-2026-90561(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 30× in last 7d / 36× 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. 2026-09-21 07:22 UTCEG score recompute
  2. 2026-09-21 07:22 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 19:05 UTCGHSA enrichment
  5. 2026-09-20 06:59 UTCGHSA enrichment
  6. 2026-09-19 18:42 UTCEG score recompute
  7. 2026-09-19 18:42 UTCGHSA enrichment
  8. 2026-09-19 06:37 UTCEG score recompute
  9. 2026-09-19 06:37 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:33 UTCEG score recompute
  12. 2026-09-18 18:33 UTCGHSA enrichment
  13. 2026-09-18 17:29 UTCEG score recompute
  14. 2026-09-18 17:29 UTCGHSA enrichment
  15. 2026-09-18 12:10 UTCGHSA enrichment
  16. 2026-09-18 00:05 UTCEG score recompute
  17. 2026-09-18 00:05 UTCGHSA enrichment
  18. 2026-09-17 19:32 UTCEPSS rescore
  19. 2026-09-17 12:00 UTCGHSA enrichment
  20. 2026-09-16 23:55 UTCEG score recompute
  21. 2026-09-16 23:55 UTCGHSA enrichment
  22. 2026-09-16 14:09 UTCEPSS rescore
  23. 2026-09-16 11:50 UTCEG score recompute
  24. 2026-09-16 11:50 UTCGHSA enrichment
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 11 more
  1. 2026-09-15 23:45 UTCGHSA enrichment
  2. 2026-09-15 11:40 UTCEG score recompute
  3. 2026-09-15 11:40 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 23:35 UTCGHSA enrichment
  6. 2026-09-14 11:30 UTCGHSA enrichment
  7. 2026-09-13 23:26 UTCEG score recompute
  8. 2026-09-13 23:26 UTCGHSA enrichment
  9. 2026-09-13 11:21 UTCEG score recompute
  10. 2026-09-13 10:50 UTCEG score recompute
  11. 2026-09-13 10:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90561?
CVE-2026-90561 is a high vulnerability published on September 13, 2026. Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an…
When was CVE-2026-90561 disclosed?
CVE-2026-90561 was first published in the National Vulnerability Database on September 13, 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-2026-90561 actively exploited?
CVE-2026-90561 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 85.1% of all scored CVEs.
What is the CVSS score of CVE-2026-90561?
CVE-2026-90561 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-90561?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90561, 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

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