CVE-2025-41346 Stored Cross-Site Scripting (XSS) in WinPlus by Informática del Este

Critical 9.3 Published 18 Nov 2025 Updated 18 Feb 2026

Attackers can impersonate users and compromise accounts by exploiting faulty authorization controls that rely on predictable numerical IDs.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-41346?

CVE-2025-41346 is a critical authentication bypass vulnerability in Informatica del Este WinPlus, published on 18 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Faulty authorization control in software WinPlus v24.11.27 by Informática del Este that allows another user to be impersonated simply by knowing their 'numerical ID', meaning that an attacker could compromise another user's account, thereby affecting the confidentiality, integrity, and availability of the data stored in the application.

Weakness: CWE-863

Which versions are affected by CVE-2025-41346?

It affects 1 product.

Products include Iest Winplus.

How do I fix CVE-2025-41346?

No fix has been published for CVE-2025-41346 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-41346 being exploited?

There is no known exploitation of CVE-2025-41346 in the wild and no public exploit code.

Sources

Also known as GHSA-4486-rqpc-38g7.