CVE-2023-6209

Summary

CVE-2023-6209 is a vulnerability affecting Firefox versions below 120, Firefox ESR below 115.5.0, and Thunderbird below 115.5. The issue stems from an incorrect parsing of relative URLs that begin with three slashes. A maliciously crafted path-traversal "/../" sequence in the URL could override the intended host, potentially leading to security issues on affected websites. This vulnerability poses a risk to users of these browsers and email clients.

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