CVE-2026-30877Network attack vector

Administrator command execution via unneutralized update input

Published Mar 31, 2026 · Updated Mar 31, 2026

OS command injection in baserCMS before 5.2.3 allows remote authenticated users with administrator privileges to execute server commands. The core update functionality incorporates administrator-controlled input into an OS command without neutralizing shell metacharacters before execution. A valid administrator session is required, and commands run with the privileges of the operating-system account that runs baserCMS.

CVSS severity9.1
Critical
EPSS probability1.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in baserCMS before 5.2.3 allows remote authenticated users with administrator privileges to execute server commands. The core update functionality incorporates administrator-controlled input into an OS command without neutralizing shell metacharacters before execution. A valid administrator session is required, and commands run with the privileges of the operating-system account that runs baserCMS.

The record

CVE
CVE-2026-30877
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
baserCMS Users Community
Product
baserCMS
Classifications
CWE-78, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

baserCMS Users Community · baserCMSversion=< 5.2.3

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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