Improper input validation in VMware Spring Security
CVE-2026-59354
In versions of Spring Security's OAuth2 Authorization Server module 7.0.0 through 7.0.4, when Dynamic Client Registration is explicitly enabled, the registration endpoint performs insufficient validation of certain client metadata fields supplied by the registering client. An attacker who possesses a valid Initial Access Token can register a malicious client with crafted metadata, which, depending on server configuration and how the metadata is later rendered or used, may result in Stored Cross-Site Scripting (XSS), Privilege Escalation, or Server-Side Request Forgery (SSRF).
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
Weakness classification (CWE)
References
- spring.io/security/cve-2026-59354 (vendor-advisory, Vendor Advisory)
- nvd.nist.gov/vuln-metrics/cvss/v3-calculator (US Government Resource, technical-description, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-59354?
- CVE-2026-59354 is a critical-severity vulnerability in VMware Spring Security, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-08-27.
- How severe is CVE-2026-59354?
- Critical severity. CVSS v3 base score is 9.6 out of 10.