CVE-2026-22748
Description
A flaw was found in Spring Security. When an application is configured to decode JSON Web Tokens (JWTs) using NimbusJwtDecoder or NimbusReactiveJwtDecoder, it may not properly validate these tokens if an OAuth2TokenValidator<Jwt> is not explicitly configured. This oversight could allow an attacker with low privileges to bypass security checks, potentially leading to unauthorized actions or data manipulation within the application.
Mitigation
To mitigate this issue, applications using Spring Security's `NimbusJwtDecoder` or `NimbusReactiveJwtDecoder` must explicitly configure an `OAuth2TokenValidator<Jwt>`. This ensures proper validation of JSON Web Tokens, preventing unauthorized access or data manipulation. Consult Spring Security documentation for correct implementation of `OAuth2TokenValidator<Jwt>` within your application's security configuration. A restart or reload of the affected application may be required for the changes to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 6.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Understanding the Weakness (CWE)
Access Control,Integrity,Confidentiality
Technical Impact: Gain Privileges or Assume Identity; Modify Application Data; Execute Unauthorized Code or Commands
An attacker could gain access to sensitive data and possibly execute unauthorized code.
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