CVE-2023-52081

Summary

CVE-2023-52081 is a vulnerability affecting the ffcss CLI tool used for configuring Firefox CSS themes. In earlier versions, before 0.2.0, the `lookupPreprocess()` function was designed to filter certain characters in a regex pattern. However, due to the use of NFKD normalization, which enables late Unicode normalization, this validation can be bypassed with equivalent Unicode characters, such as U+FE4D (﹍). This bypass allows the re-introduction of disallowed characters, like U+005F (_). Although the `lookupPreprocess()` function is only used for case-insensitive searches, ignoring dashes, underscores, and dots, the potential security impact is classified as low. This issue is resolved in version 0.2.0, and there are currently no known workarounds.

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