# Falang multilanguage for WordPress <= 1.4.5 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Term Translation

- **ID:** WPSEC-2026-0837
- **Plugin:** Falang multilanguage for WordPress (`falang`), https://wordpress.org/plugins/falang/
- **Affected versions:** all versions before 1.4.6
- **Fixed in:** 1.4.6 (Update to 1.4.6 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/falang
- **Fix released:** 2026-10-12
- **Published:** 2026-10-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0837/

## Description

The Falang multilanguage for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the term translation AJAX actions (falang_term_translation and falang_term_update_translation) in all versions up to, and including, 1.4.5, due to a missing capability check on the term translation save handler, insufficient input sanitization of translated term fields and term meta, and insufficient output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to change the translation of any term and inject arbitrary web scripts that execute whenever a user, including an administrator, opens the translated term or a page that shows it.

## References

- https://wpsec.com/vuln/WPSEC-2026-0837/
- https://plugins.svn.wordpress.org/falang/tags/1.4.6/
- https://wordpress.org/plugins/falang/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0837/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.