cgi-bin/qcmap_web_cgi on JioFi 4G M2S 1.0.2 devices has XSS and HTML injection via the mask POST parameter.
https://www.exploit-db.com/exploits/46751/
https://gkaim.com/cve-2019-7438-xss-vikas-chaudhary/
https://gkaim.com/cve-2019-7438-html-vikas-chaudhary/
http://packetstormsecurity.com/files/152625/JioFi-4G-M2S-1.0.2-Cross-Site-Scripting.html