CVE-2026-118011
High
Description
Frame poisoning in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
SeverityHigh
CVSS8.8
Exploit probability—
ProductFirefox
PublishedOct 27, 2026
First seenOct 27, 2026
Weakness typeCWE-451CWE-451
How to fix
Update
- Firefox159 or later
- Thunderbird159 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox | No range specified | 159 |
| Thunderbird | No range specified | 159 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
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