Stored XSS, SSRF, and escalation via unvalidated metadata
Published Aug 27, 2026 · Updated Aug 28, 2026
Metadata validation flaws in Spring Security 7.0.0 through 7.0.4 allow remote authenticated users to cause stored XSS, SSRF, or privilege escalation. The Dynamic Client Registration endpoint accepts crafted client metadata without sufficient field validation, allowing later rendering or use to cross security boundaries. Exposure requires explicitly enabled Dynamic Client Registration, a valid Initial Access Token, and a server configuration that renders or uses the crafted metadata.
Summary
What happened
Metadata validation flaws in Spring Security 7.0.0 through 7.0.4 allow remote authenticated users to cause stored XSS, SSRF, or privilege escalation. The Dynamic Client Registration endpoint accepts crafted client metadata without sufficient field validation, allowing later rendering or use to cross security boundaries. Exposure requires explicitly enabled Dynamic Client Registration, a valid Initial Access Token, and a server configuration that renders or uses the crafted metadata.
The record
- CVE
- CVE-2026-59354
- Published
- Aug 27, 2026
- Updated
- Aug 28, 2026
- Vendor
- Spring
- Product
- Spring Security
- Classifications
- T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.0.0 <=7.0.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo