If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
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AV:NAC:LPR:NUI:RScope
S:CImpact
C:LI:LA:NCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N