Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity security flaw in basercms from baserproject. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 65.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	baserproject/basercms	5.2.3	GHSA-8cr7-r8qw-gp3c

Affected products (as reported)

Vendor	Product	Versions
baserproject	basercms	< 5.2.3

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/baserproject/basercms/security/advisories/GHSA-8cr7-r8qw-gp3c x_refsource_CONFIRM
https://basercms.net/security/JVN_20837860 x_refsource_MISC
https://github.com/baserproject/basercms/releases/tag/5.2.3 x_refsource_MISC