BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF

Advisories

severity: medium
date: December 10, 2025
Affecting: Model: XT, XD, HD, LS
Firmware / OS version: <= 8.2.26
CVE: CVE-2020-36884
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
References: ExploitDB-48843
BrightSign Homepage
Zero Science Lab Disclosure (ZSL-2020-5595)
Credit: LiquidWorm as Gjoko Krstic of Zero Science Lab
Description: BrightSign Digital Signage Diagnostic Web Server 8.2.26 and less contains an unauthenticated server-side request forgery vulnerability in the 'url' GET parameter of the Download Speed Test service. Attackers can specify external domains to bypass firewalls and perform network enumeration by forcing the application to make arbitrary HTTP requests to internal network hosts.