| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.3.0< 55.0 | 52.3.055.0 |
| thunderbird | < 52.3.0 | 52.3.0 |
When a page's content security policy (CSP) header contains a "sandbox" directive, other directives are ignored. This results in the incorrect enforcement of CSP. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
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