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.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2020-05/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-06/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-07/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1602944 | permissions required |
| https://usn.ubuntu.com/4278-2/ | vendor advisory |
| https://security.gentoo.org/glsa/202003-02 | vendor advisory |
| https://security.gentoo.org/glsa/202003-10 | vendor advisory |
| https://usn.ubuntu.com/4328-1/ | vendor advisory |
| https://usn.ubuntu.com/4335-1/ | vendor advisory |