Quick answers
- Is CVE-2026-118004 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118004 being exploited in the wild.
- How severe is CVE-2026-118004?
- Informational severity, published 27 October 2026.
- Which products and versions are affected?
- Mozilla Firefox before 159; Mozilla Firefox ESR before 153.6.
- Is there a fix for CVE-2026-118004?
- Yes: fixed in Firefox 159, Firefox ESR 153.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118004 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-118004?
- Check whether you run Mozilla Firefox or Mozilla Firefox ESR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Firefox 159, Firefox ESR 153.6
Technical details
An incorrect boundary condition exists in the CSS Transitions and Animations component of Firefox. The vulnerability can be triggered through crafted CSS animations delivered via a web page, requiring user interaction to visit the malicious site. A successful exploit could lead to memory corruption or code execution within the browser's security context.
Affected products
- Mozilla Firefox before 159
- Mozilla Firefox ESR before 153.6
Timeline
- 2026-10-27: disclosed