Overview
CVE-2026-45091 highlights how a secret-management library can leak sensitive data through token payloads when not designed with encrypted or scoped data in mind. In sealed-env's enterprise mode, versions 0.1.0-alpha.1 through 0.1.0-alpha.3 embedded the operator's literal TOTP secret in the JWS payload of every minted unseal token. Since the JWS payload is base64-encoded JSON and not encrypted, anyone who can observe the token (CI build logs, container env dumps, kubectl describe pod, error traces, logging back-ends) could decode the payload and read the TOTP secret in plaintext. In a Spring Boot application, this kind of leakage couples with the broader class of Broken Object Property Level Authorization (BOPLA) risks: if an API exposes full domain objects with multiple properties, an attacker who gains access to a token that represents broader access could also view or infer sensitive properties that should be restricted. The vulnerability is tracked under CWE-200 (Information Exposure) and CWE-522 (Insufficiently Protected Credentials), and the practical effect is that secret data can be exposed even when the high-level authorization checks are in place. This guide references the CVE-2026-45091 details to illustrate how a similar failure mode could manifest in Spring Boot services relying on token-based secret management and how to fix it in real Java code. The root lesson is that token payloads must not carry sensitive material, and APIs must enforce per-property authorization so that even valid object access does not leak restricted fields.
Affected Versions
0.1.0-alpha.1 through 0.1.0-alpha.3
Code Fix Example
Spring Boot API Security Remediation
/* Vulnerable pattern (no per-property filtering; returns entire entity) and fixed pattern (explicit per-property DTO with access checks) in a single, illustrative Spring Boot setup. This example uses inner static classes for brevity and demonstrates the difference between returning a full entity and returning a restricted view of that entity. */
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.security.core.Authentication;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.stereotype.Service;
import org.springframework.stereotype.Component;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
// Vulnerable pattern: returns the full entity with all properties (no per-property filtering)
@RestController
@RequestMapping("/api")
public static class VulnerableController {
private final UserService userService;
public VulnerableController(UserService userService) { this.userService = userService; }
@GetMapping("/users/{id}")
public UserEntity getUserVulnerable(@PathVariable Long id) {
return userService.findById(id);
}
}
// Fixed pattern: returns a restricted DTO and enforces per-property access
@RestController
@RequestMapping("/api")
public static class FixedController {
private final UserService userService;
private final PropertySecurityService security;
public FixedController(UserService userService, PropertySecurityService security) {
this.userService = userService; this.security = security; }
@GetMapping("/users/{id}")
public UserPublicDTO getUserFixed(@PathVariable Long id, Authentication auth) {
UserEntity user = userService.findById(id);
if (!security.canViewUser(auth, user)) {
throw new AccessDeniedException("Not authorized to view this user data");
}
return new UserPublicDTO(user);
}
}
public static class UserEntity {
private Long id;
private String username;
private String email;
private String phone;
private double salary;
private String secretNote;
public UserEntity(Long id, String username, String email, String phone, double salary, String secretNote) {
this.id = id; this.username = username; this.email = email; this.phone = phone; this.salary = salary; this.secretNote = secretNote; }
public Long getId() { return id; }
public String getUsername() { return username; }
public String getEmail() { return email; }
public String getPhone() { return phone; }
public double getSalary() { return salary; }
public String getSecretNote() { return secretNote; }
}
public static class UserPublicDTO {
public Long id;
public String username;
public String email;
public UserPublicDTO(UserEntity u) { this.id = u.id; this.username = u.username; this.email = u.email; }
}
@Service
public static class UserService {
public UserEntity findById(Long id) {
// In a real app, fetch from repository; this is a deterministic example
return new UserEntity(id, "alice", "[email protected]", "+1-555-0100", 100000.0, "secret");
}
}
@Component
public static class PropertySecurityService {
public boolean canViewUser(Authentication auth, UserEntity user) {
// Example: only admins can view private fields; all authenticated users can view public fields
return auth != null && auth.getAuthorities().stream()
.anyMatch(granted -> granted.getAuthority().equals("ROLE_ADMIN"));
}
}
}