CVE-2026-15943: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-rpfh-mgxm-c6hc
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CVSS 5.5
CWE-1288
Published
Advisory Summary

CVE-2026-15943 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-1288: Improper Validation of Consistency within Input) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives a complex input with multiple elements or fields that must be consistent with each other, but it does not validate or incorrectly validates that the input is actually consistent.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-15943 at a Glance

CVE Identifier CVE-2026-15943
GHSA Identifier GHSA-rpfh-mgxm-c6hc
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-1288: Improper Validation of Consistency within Input
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-15943

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-15943, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1288: Improper Validation of Consistency within Input, where the product receives a complex input with multiple elements or fields that must be consistent with each other, but it does not validate or incorrectly validates that the input is actually consistent. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.

References

NVD — CVE-2026-15943 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15943
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-15943
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2501270

Frequently Asked Questions

What is CVE-2026-15943?
CVE-2026-15943 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1288: Improper Validation of Consistency within Input.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-15943?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-15943?
CVE-2026-15943 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2026-15943?
CVE-2026-15943 is classified under CWE-1288: Improper Validation of Consistency within Input (The product receives a complex input with multiple elements or fields that must be consistent with each other, but it does not validate or incorrectly validates that the input is actually consistent.).
How can I check Maven dependencies for CVE-2026-15943?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rpfh-mgxm-c6hc",
  "modified" : "2026-07-17T12:31:30Z",
  "published" : "2026-07-17T12:31:30Z",
  "aliases" : [ "CVE-2026-15943" ],
  "details" : "A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15943"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-15943"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2501270"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1288" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-17T12:17:03Z"
  }
}