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BrightSign players running BrightSign OS series 4 prior to v8.5.53.1 or 
series 5 prior to v9.0.166 use a default password that is guessable with
 knowledge of the device information. The latest release fixes this 
issue for new installations; users of old installations are encouraged 
to change all default passwords.

CVE-2025-54756 identifies a critical security vulnerability in BrightSign OS series 4 and 5 players, which are widely used digital signage media players. The root cause is the use of a default password that is guessable when an attacker has knowledge of the device information, such as serial numbers or device-specific identifiers. This vulnerability is classified under CWE-1392, indicating improper default credential management. The CVSS 3.1 base score of 8.4 reflects its high severity, with attack vector being local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The vulnerability impacts confidentiality, integrity, and availability (all rated high), meaning an attacker can fully compromise the device, potentially gaining administrative access, altering content, or disrupting service. BrightSign has addressed this issue in newer firmware releases (series 4 v8.5.53.1 and series 5 v9.0.166), which remove or secure default credentials for new installations. However, legacy devices remain vulnerable unless users manually change default passwords. No public exploits have been reported yet, but the simplicity of guessing default credentials makes exploitation feasible in environments where attackers can access the device network or physical location.

Detailed information about CVE-2025-54756: CWE-1392 in BrightSign BrightSign OS series 4 players affecting BrightSign BrightSign OS series 4 players. Get real-t

CVE-2025-54756: CWE-1392 in BrightSign BrightSign OS series 4 players - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-54756: CWE-1392 in BrightSign BrightSign OS series 4 players

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