CVE-2026-15387: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-8x29-wc3v-56mg
Share
CVSS 4.3
CWE-349
Published
Advisory Summary

CVE-2026-15387 is a MODERATE (CVSS 4.3) security vulnerability vulnerability (CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-15387 at a Glance

CVE Identifier CVE-2026-15387
GHSA Identifier GHSA-8x29-wc3v-56mg
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

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

How to Fix CVE-2026-15387

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-2026-15387, 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-349: Acceptance of Extraneous Untrusted Data With Trusted Data, where the product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted. 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

GitLab has remediated an issue in GitLab EE affecting all versions from 19.1 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have influenced the execution environment of Pipeline Execution Policy enforcement jobs, due to improper handling of job dependencies.

References

NVD — CVE-2026-15387 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15387
hackerone.com/reports/3754358 WEB
https://hackerone.com/reports/3754358
docs.gitlab.com/releases/patches/pa... WEB
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released
gitlab.com/gitlab-org/gitlab/-... WEB
https://gitlab.com/gitlab-org/gitlab/-/work_items/605632

Frequently Asked Questions

What is CVE-2026-15387?
CVE-2026-15387 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-15387?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-15387?
CVE-2026-15387 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-15387?
CVE-2026-15387 is classified under CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data (The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.).
How can I check Maven dependencies for CVE-2026-15387?
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-8x29-wc3v-56mg",
  "modified" : "2026-08-26T18:31:54Z",
  "published" : "2026-08-26T18:31:54Z",
  "aliases" : [ "CVE-2026-15387" ],
  "details" : "GitLab has remediated an issue in GitLab EE affecting all versions from 19.1 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have influenced the execution environment of Pipeline Execution Policy enforcement jobs, due to improper handling of job dependencies.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15387"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/3754358"
  }, {
    "type" : "WEB",
    "url" : "https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.com/gitlab-org/gitlab/-/work_items/605632"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-349" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T14:17:07Z"
  }
}