Improper Validation of Syntactic Correctness of Input Affecting org.springframework.security:spring-security-oauth2-authorization-server package, versions [7.0.0,7.0.5)
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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- published27 Aug 2026
- disclosed21 Apr 2026
- creditKelvin Mbogo (@addcontent)
Introduced: 21 Apr 2026
CVE-2026-59354 (opens in a new tab)How to fix?
Upgrade org.springframework.security:spring-security-oauth2-authorization-server to version 7.0.5 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Syntactic Correctness of Input in OAuth2ClientRegistrationAuthenticationProvider.java. An attacker with a valid Initial Access Token can register a client with crafted metadata, including redirect URIs, by submitting a registration request to the dynamic client registration endpoint. The registration flow accepts malformed or dangerous client metadata without adequate checks, which can lead to stored XSS, SSRF, or privilege escalation when that metadata is later processed or rendered.