CVE-2021-23999
High
Description
If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedJun 24, 2021
First seenJun 24, 2021
How to fix
Update
- mozilla firefox88.0 or later
- mozilla firefox_esr78.10 or later
- mozilla thunderbird78.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 88.0 | 88.0 |
| mozilla firefox_esr | v < 78.10 | 78.10 |
| mozilla thunderbird | v < 78.10 | 78.10 |
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