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

> Unauthenticated users can bypass administrative controls to submit mail forms via the public API, enabling spam and abuse.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-8cr7-r8qw-gp3c

## What is CVE-2026-30878?

CVE-2026-30878 is a medium-severity missing authorization vulnerability in Basercms Basercms, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-30878?

2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `baserproject/basercms` | Packagist | All versions | 5.2.3 |
| `baserproject/basercms` | Packagist | All versions | 5.2.3 |

Products: Basercms Basercms.

## How do I fix CVE-2026-30878?

Upgrade baserproject/basercms to 5.2.3 or later.

## Is CVE-2026-30878 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30878 exists.

## Other vulnerabilities in Basercms Basercms

- [CVE-2023-25654](https://insights.sbomify.com/CVE-2023-25654/): baserCMS File Uploader Remote Code Execution (RCE) vulnerability (critical 9.8)
- [CVE-2023-25655](https://insights.sbomify.com/CVE-2023-25655/): baserCMS allows any file to be uploaded (critical 9.8)
- [CVE-2017-10842](https://insights.sbomify.com/CVE-2017-10842/): baserCMS SQL Injection vulnerability (critical 9.8)
- [CVE-2026-30880](https://insights.sbomify.com/CVE-2026-30880/): baserCMS: OS command injection vulnerability in installer (critical 9.2)
- [CVE-2026-21861](https://insights.sbomify.com/CVE-2026-21861/): baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30878 and fix it if it is affected.

What it is: CVE-2026-30878 is a medium-severity missing authorization vulnerability in Basercms Basercms, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30878 exists.

Affected packages and fixed versions:
- baserproject/basercms (Packagist): affected all versions; fixed in 5.2.3
- baserproject/basercms (Packagist): affected all versions; fixed in 5.2.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-30878/ (Markdown: https://insights.sbomify.com/CVE-2026-30878/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30878
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30878
- OSV: https://osv.dev/vulnerability/CVE-2026-30878

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-30878/
Summaries are generated and may contain mistakes; the official description above is the record.