CVE-2026-90812: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-27qc-j388-jw8p
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CVSS 4.3
CWE-266
Published
Advisory Summary

CVE-2026-90812 is a LOW (CVSS 4.3) security vulnerability vulnerability (CWE-266: Incorrect Privilege Assignment) affecting Software libraries in the Maven ecosystem. The weakness occurs when a product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-90812 at a Glance

CVE Identifier CVE-2026-90812
GHSA Identifier GHSA-27qc-j388-jw8p
Severity LOW
CVSS v3.1 Base Score 4.3
CWE Classification CWE-266: Incorrect Privilege Assignment
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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-90812

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-2026-90812, 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-266: Incorrect Privilege Assignment, where a product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor. 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 security vulnerability has been detected in cosmicstack-labs mercury-agent up to 1.2.0. This impacts the function checkShellCommand of the file src/capabilities/permissions.ts of the component Shell Command Permission. The manipulation leads to incorrect privilege assignment. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

References

NVD — CVE-2026-90812 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90812
Software Source Repository REPOSITORY
https://github.com/cosmicstack-labs/mercury-agent/issues/80
Software Source Repository REPOSITORY
https://github.com/cosmicstack-labs/mercury-agent
vuldb.com/cve/cve-2026-90812 WEB
https://vuldb.com/cve/CVE-2026-90812
vuldb.com/submit/922878 WEB
https://vuldb.com/submit/922878
vuldb.com/vuln/403314 WEB
https://vuldb.com/vuln/403314
vuldb.com/vuln/403314/cti WEB
https://vuldb.com/vuln/403314/cti

Frequently Asked Questions

What is CVE-2026-90812?
CVE-2026-90812 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-266: Incorrect Privilege Assignment.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-90812?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-90812?
CVE-2026-90812 has a CVSS v3.1 base score of 4.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-90812?
CVE-2026-90812 is classified under CWE-266: Incorrect Privilege Assignment (A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.).
How can I check Maven dependencies for CVE-2026-90812?
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-27qc-j388-jw8p",
  "modified" : "2026-09-14T21:31:43Z",
  "published" : "2026-09-14T21:31:43Z",
  "aliases" : [ "CVE-2026-90812" ],
  "details" : "A security vulnerability has been detected in cosmicstack-labs mercury-agent up to 1.2.0. This impacts the function checkShellCommand of the file src/capabilities/permissions.ts of the component Shell Command Permission. The manipulation leads to incorrect privilege assignment. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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-2026-90812"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cosmicstack-labs/mercury-agent/issues/80"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cosmicstack-labs/mercury-agent"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-90812"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/922878"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/403314"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/403314/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-266" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-14T19:18:12Z"
  }
}