WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.
Vulnerable Product | Search on Vulmon | Subscribe to Product |
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mozilla firefox |
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canonical ubuntu linux 14.04 |
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canonical ubuntu linux 16.04 |
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canonical ubuntu linux 17.10 |