# CVE-2026-40909

> Vulnerability · severity: **HIGH** (CVSS 8.7).

## Description

WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (`locale/save.php`) constructs a file path by directly concatenating `$_POST['flag']` into the path at line 30 without any sanitization. The `$_POST['code']` parameter is then written verbatim to that path via `fwrite()` at line 40. An admin attacker (or any user who can CSRF an admin, since no CSRF token is checked and cookies use `SameSite=None`) can traverse out of the `locale/` directory and write arbitrary `.php` files to any writable location on the filesystem, achieving Remote Code Execution. Commit 57f89ffbc27d37c9d9dd727212334846e78ac21a fixes the issue.

## Key facts

- **CVE ID:** CVE-2026-40909
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 8.7
- **CWE codes:** CWE-22

## Affected products

- `wwbn:avideo`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40909

## Citation

> AI Analytics. CVE-2026-40909. Retrieved 2026-06-26 from https://api.ai-analytics.org/cve/CVE-2026-40909. Derived from NIST NVD. Licensed CC0.

---

*[Dataset catalog](https://api.ai-analytics.org/datasets/) · [AI Analytics](https://api.ai-analytics.org/) · CC0 1.0*