CVE-2026-30877 — Vulnerability in baserproject/basercms — CVE Details

CRITICAL

baserCMS Update Functionality Vulnerable to OS Command Injection

Published March 31, 2026Updated September 10, 2026Source: osv

Summary

### Summary The latest version of baserCMS (basercms-5.2.2) contains an OS command injection vulnerability (CWE-78) in its update functionality. Due to this issue, an authenticated user with administrator privileges in baserCMS can execute arbitrary OS commands on the server with the privileges of the user account running baserCMS. ### Details Please refer to the attached materials. [OSコマンドインジェクション（baserCMSのアップデート機能）.pdf](https://github.com/user-attachments/files/25468689/OS.baserCMS.pdf) ### Impact An authenticated user with administrator privileges in baserCMS can execute OS commands on the server with the privileges of the user account running baserCMS.

Advisory Timeline

First published March 31, 2026 (195 days ago).
Last revised September 10, 2026 — 162 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer

Update baserproject/basercms to 5.2.3 or later

composer require "baserproject/basercms:^5.2.3"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: packagist (1).

Package	Ecosystem	Affected	Fixed In
baserproject/basercms	packagist	0.0.1, 0.0.2, 0.0.3, 0.0.4 (+151 more)	5.2.3

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-78
OS Command InjectionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-30877?: baserCMS Update Functionality Vulnerable to OS Command Injection This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-30877?: CVE-2026-30877 affects baserproject/basercms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-30877 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-m9g7-rgfc-jcm7

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