CVE-2026-15966 Improper CORS handling in MOVEit Transfer

High 7.5 Published 23 Jul 2026 Updated 25 Jul 2026

Attackers can bypass cross-domain restrictions to access sensitive data or perform unauthorized actions due to permissive CORS settings.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-15966?

CVE-2026-15966 is a high-severity vulnerability in Progress MOVEit Transfer, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Permissive cross-domain security policy with untrusted domains vulnerability in Progress MOVEit Transfer.

This issue affects MOVEit Transfer: before 2025.1.5, from 2026.0.0 before 2026.0.3.

Weakness: CWE-942

Which versions are affected by CVE-2026-15966?

It affects 1 product.

Products include Progress Moveit Transfer.

How do I fix CVE-2026-15966?

No fix has been published for CVE-2026-15966 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-15966 being exploited?

There is no known exploitation of CVE-2026-15966 in the wild and no public exploit code.

Sources

Also known as GHSA-9rcg-65vx-h53x.