CVE-2025-8036 DNS rebinding circumvents CORS
Attackers can bypass CORS protections via DNS rebinding due to cached preflight responses, affecting Thunderbird and Firefox users.
- 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-2025-8036?
CVE-2025-8036 is a high-severity vulnerability in Mozilla Firefox, published on 22 Jul 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
Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.
Weakness: CWE-350
Which versions are affected by CVE-2025-8036?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2025-8036?
Upgrade to a fixed version.
Is CVE-2025-8036 being exploited?
There is no known exploitation of CVE-2025-8036 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-5g22-6w6r-pr2m, UBUNTU-CVE-2025-8036.