CVE-2026-4688 Sandbox escape due to use-after-free in the Disability Access APIs component
Attackers can escape the sandbox and execute arbitrary code via a use-after-free flaw in the Disability Access APIs.
- 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
- Available
What is CVE-2026-4688?
CVE-2026-4688 is a critical use after free vulnerability in Mozilla Firefox, published on 24 Mar 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
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Which versions are affected by CVE-2026-4688?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2026-4688?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-4688 being exploited?
There is no known exploitation of CVE-2026-4688 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2026-4688, GHSA-7364-g429-cg4v, UBUNTU-CVE-2026-4688.