CVE-2025-55032 Focus incorrectly ignores Content-Disposition headers for some MIME types

Medium 6.1 Published 19 Aug 2025 Updated 13 Apr 2026

Attackers can execute scripts by bypassing Content-Disposition headers in Focus for iOS, requiring users to update the browser.

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-2025-55032?

CVE-2025-55032 is a medium-severity cross-site scripting vulnerability in Mozilla Focus for iOS, published on 19 Aug 2025. 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

Focus for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline, potentially allowing for XSS attacks. This vulnerability was fixed in Focus for iOS 142.

Weakness: CWE-601

Which versions are affected by CVE-2025-55032?

It affects 1 product.

Products include Mozilla Firefox Focus.

How do I fix CVE-2025-55032?

No fix has been published for CVE-2025-55032 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-55032 being exploited?

There is no known exploitation of CVE-2025-55032 in the wild and no public exploit code.

Sources

Also known as GHSA-4cqw-2v9h-hfqw.