Origin Validation Error Affecting io.vertx:vertx-core package, versions [4.0.0.Beta1,4.5.30)[5.0.0.CR1,5.1.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IOVERTX-19433234
- published31 Aug 2026
- disclosed14 Jul 2026
- creditKairo de Araujo
Introduced: 14 Jul 2026
CVE-2026-15075 (opens in a new tab)How to fix?
Upgrade io.vertx:vertx-core to version 4.5.30, 5.1.5 or higher.
Overview
io.vertx:vertx-core is a tool-kit for building reactive applications on the JVM.
Affected versions of this package are vulnerable to Origin Validation Error in the DefaultRedirectHandler, which forwards request headers, including Authorization, Cookie, Proxy-Authorization, and custom headers such as X-API-Token, across cross-origin redirects without comparing the scheme, host, and port of the origin. An attacker controlling a redirect destination can capture bearer tokens, basic-auth credentials, session cookies, and API keys attached to the original request by returning a redirect to a host they control. This requires the attacker to cause a Vert.x HttpClient request to be redirected to that host, such as through a webhook dispatcher or image proxy that follows redirects.
Workaround
This vulnerability can be avoided by disabling automatic redirect following on the HttpClient (for example setFollowRedirects(false)) for requests that carry credentials, so credential headers are not replayed to a redirect target.