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CVE-2026-30878— baserCMS: Mail Form Acceptance Bypass via Public API

Quick assessment

Affected
baserproject basercms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

baserCMS是baserCMS团队的一套企业级内容管理系统（CMS）。 baserCMS 5.2.3之前版本存在安全漏洞，该漏洞源于公共邮件提交API存在缺陷，可能导致绕过管理控制并滥用表单。

CVSS 5.3 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-30878

Vulnerability Information
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Vulnerability Title
baserCMS: Mail Form Acceptance Bypass via Public API
Source: CVE Program / CVE List V5
Vulnerability Description
baserCMS is a website development framework. Prior to version 5.2.3, a public mail submission API allows unauthenticated users to submit mail form entries even when the corresponding form is not accepting submissions. This bypasses administrative controls intended to stop form intake and enables spam or abuse via the API. This issue has been patched in version 5.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
baserCMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
baserCMS是baserCMS团队的一套企业级内容管理系统（CMS）。 baserCMS 5.2.3之前版本存在安全漏洞，该漏洞源于公共邮件提交API存在缺陷，可能导致绕过管理控制并滥用表单。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
baserproject basercms < 5.2.3 -

II. Public POCs for CVE-2026-30878

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III. Intelligence Information for CVE-2026-30878

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Vendor Advisories for CVE-2026-30878 (2)

Vendor Pages for CVE-2026-30878 (1)

Same Patch Batch · baserproject · 2026-03-31 · 9 CVEs total

CVE-2026-21861 9.1 CRITICAL baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
CVE-2026-30877 9.1 CRITICAL baserCMS: OS Command Injection in the baserCMS Update Functionality
CVE-2025-32957 8.7 HIGH baserCMS: unsafe File Upload Leading to Remote Code Execution (RCE)
CVE-2026-30940 7.2 HIGH baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE
CVE-2026-32734 7.1 HIGH baserCMS: Multiple vulnerabilities in baserCMS
CVE-2026-27697 baserCMS: SQL injection vulnerability in blog post
CVE-2026-30880 baserCMS: OS command injection vulnerability in installer
CVE-2026-30879 baserCMS: Cross-site scripting vulnerability in blog post

IV. Related Vulnerabilities

Same product: basercms
Same vendor: baserproject
Same weakness: CWE-285

V. Comments for CVE-2026-30878

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