CVE-2026-19884: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-4g73-gqqh-rfjc
Share
CWE-15
Published
Advisory Summary

CVE-2026-19884 is a HIGH security vulnerability vulnerability (CWE-15: External Control of System or Configuration Setting) affecting Software libraries in the Maven ecosystem. The weakness occurs when one or more system settings or configuration elements can be externally controlled by a user.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-19884 at a Glance

CVE Identifier CVE-2026-19884
GHSA Identifier GHSA-4g73-gqqh-rfjc
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-15: External Control of System or Configuration Setting
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-19884

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-2026-19884, 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-15: External Control of System or Configuration Setting, where one or more system settings or configuration elements can be externally controlled by a user. 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

In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration without requiring the user to trust the folder first. This affects applications built on Theia that include the git integration, such as the Theia IDE. Both Theia's own `@theia/git` extension and the builtin VS Code `git` extension run git commands such as `git status` as soon as a repository is detected. Since git honors repository-local configuration, a folder containing an attacker-controlled `.git/config` with `core.fsmonitor` (or a comparable hook-like setting) causes the configured command to be executed. The configuration can be delivered by burying a bare repository inside a regular repository (OVE-20210718-0001), so cloning an attacker-supplied repository and opening it in a Theia-based application is sufficient to execute arbitrary commands with the privileges of the user, without any confirmation prompt. As of 1.70.0, plugins that declare `capabilities.untrustedWorkspaces.supported: false`, which includes the builtin git extension, are no longer loaded or activated in an untrusted workspace, and the deprecated `@theia/git` extension has been removed, so no git command is executed against an untrusted folder.

References

NVD — CVE-2026-19884 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19884
Software Source Repository REPOSITORY
https://github.com/eclipse-theia/theia/pull/16809
Software Source Repository REPOSITORY
https://github.com/eclipse-theia/theia/pull/17098
Software Source Repository REPOSITORY
https://github.com/eclipse-theia/theia/pull/17148
Software Security Information SECURITY
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/231
Software Security Information SECURITY
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/175

Frequently Asked Questions

What is CVE-2026-19884?
CVE-2026-19884 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-15: External Control of System or Configuration Setting.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-19884?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-19884?
CVE-2026-19884 is classified under CWE-15: External Control of System or Configuration Setting (One or more system settings or configuration elements can be externally controlled by a user.).
How can I check Maven dependencies for CVE-2026-19884?
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-4g73-gqqh-rfjc",
  "modified" : "2026-08-14T18:31:37Z",
  "published" : "2026-08-14T18:31:37Z",
  "aliases" : [ "CVE-2026-19884" ],
  "details" : "In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration without requiring the user to trust the folder first. This affects applications built on Theia that include the git integration, such as the Theia IDE. Both Theia's own `@theia/git` extension and the builtin VS Code `git` extension run git commands such as `git status` as soon as a repository is detected. Since git honors repository-local configuration, a folder containing an attacker-controlled `.git/config` with `core.fsmonitor` (or a comparable hook-like setting) causes the configured command to be executed. The configuration can be delivered by burying a bare repository inside a regular repository (OVE-20210718-0001), so cloning an attacker-supplied repository and opening it in a Theia-based application is sufficient to execute arbitrary commands with the privileges of the user, without any confirmation prompt.\n\n\n\nAs of 1.70.0, plugins that declare `capabilities.untrustedWorkspaces.supported: false`, which includes the builtin git extension, are no longer loaded or activated in an untrusted workspace, and the deprecated `@theia/git` extension has been removed, so no git command is executed against an untrusted folder.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-19884"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eclipse-theia/theia/pull/16809"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eclipse-theia/theia/pull/17098"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eclipse-theia/theia/pull/17148"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/231"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/175"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-15" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-14T16:16:55Z"
  }
}