Vulnerability · Published Oct 22, 2026 · Assigned by VulnCheck

CVE-2023-54413WPML Multilingual CMS WordPress Plugin < 4.6.1 Reflected XSS via wp-login.php wp_lang

Medium 6.1

In plain English

A medium-severity cross-site scripting in WPML Multilingual CMS from OnTheGoSystems. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 75.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

WPML Multilingual CMS plugin for WordPress before 4.6.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject script by supplying crafted input in the wp_lang parameter. Attackers can lure users to /wp-login.php with a wp_lang value injecting an image input with an obfuscated onfocus handler to execute JavaScript in the victim's browser. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-11-12.

Affected products (as reported)

Vendor	Product	Versions
OnTheGoSystems	WPML Multilingual CMS	0 – before 4.6.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

WPML 4.6.1 – Important Security Update vendor-advisory
WPScan Advisory third-party-advisory
Nuclei Template technical-description
VulnCheck Advisory: WPML Multilingual CMS WordPress Plugin < 4.6.1 Reflected XSS via wp-login.php wp_lang third-party-advisory