| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.4.0< 56.0 | 52.4.056.0 |
| thunderbird | < 52.4.0 | 52.4.0 |
The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allow-same-origin" keyword were always specified. This could allow a Cross-Site Scripting (XSS) attack to be launched from unsafe content. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
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