Improper access control in Vert.x - CVE-2026-15075
Published: September 11, 2026
Vulnerability identifier: #VU148981
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15075
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in the DefaultRedirectHandler in vertx-core when following cross-origin HTTP 30x redirects. A remote attacker can cause a Vert.x HttpClient request to be redirected to an attacker-controlled host to disclose sensitive information.
Credential and custom request headers can be forwarded to the redirect destination.
Affected software
Vert.x
How to mitigate CVE-2026-15075
Install security update from vendor's website.
Vert.x - addressed in versions 4.5.30, 5.1.5