An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608 Rel.58696n and TL-WR841N v13 00000013 0.9.1 4.16 v0001.0 Build 170622 Rel.64334n devices. This issue is caused by improper session handling on the /cgi/ folder or a /cgi file. If an attacker sends a header of "Referer: http://192.168.0.1/mainFrame.htm" then no authentication is required for any action.
Multiple cross-site scripting (XSS) vulnerabilities in the TP-LINK TL-WR841N router with firmware 3.13.9 Build 120201 Rel.54965n and earlier allow remote administrators to inject arbitrary web script or HTML via the (1) username or (2) pwd parameter to userRpm/NoipDdnsRpm.htm.
Directory traversal vulnerability in the web-based management interface on the TP-LINK TL-WR841N router with firmware 3.13.9 build 120201 Rel.54965n and earlier allows remote attackers to read arbitrary files via the URL parameter.
Directory traversal vulnerability in the web-based management feature on the TP-LINK TL-WR841N router with firmware 3.13.9 build 120201 Rel.54965n and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the PATH_INFO to the help/ URI.