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[ CVE-2026-107303 · Published 8 Oct 2026 ]

JHipster: Generated Applications Allow Stored XSS via Unrestricted Blob ContentType Opened as Same-Origin Blob

CVSS 7.6 EPSS <1%1 agency advisoryFix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

JHipster is a development platform to quickly generate, develop, and deploy modern web applications and microservice architectures. Prior to generator-jhipster 9.4.0 and react-jhipster 1.1.0, generated applications can persist attacker-controlled Blob data and companion ContentType values, return them through generated REST endpoints, and pass them to the generated openFile helper in generators/client/generators/common/templates/src/main/webapp/app/shared/jhipster/data-utils.ts.ejs. The helper uses the returned ContentType as the browser Blob MIME type and opens an object URL, so a normal authenticated user with write access to a Blob-bearing entity can store active HTML or SVG content that may execute under the application origin when a privileged user opens it. Exploitability depends on the generated application's content security policy and target-browser Blob behavior. This issue is fixed in generator-jhipster 9.4.0 and react-jhipster 1.1.0.

[ Fixes ]Fixes and patches

  • generator-jhipster 9.4.0Fixed version · GitHub Advisories · npm package generator-jhipster: upgrade to 9.4.0 or later (affected < 9.4.0)
  • react-jhipster 1.1.0Fixed version · GitHub Advisories · npm package react-jhipster: upgrade to 1.1.0 or later (affected <= 1.0.3)

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

[ References ]References