BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF

published 2025-12-10 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2020-30845

cvss: 6.9; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known, plus a Nuclei check

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.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 10 mo ago (2025-12-11)

Exploit prediction

1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template BrightSign Digital Signage 8.2.26 - Server-Side Request Forgery nuclei detection template
exploit-db.com https://www.exploit-db.com/exploits/48843 referenced PoC, tagged "exploit" by a source, unverified
zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5595.php referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.9	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
CNA	4.0	6.9	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

exploit-db.com /exploits/48843
exploit
zeroscience.mk /en/vulnerabilities/ZSL-2020-5595.php
third-party-advisory, exploit
brightsign.biz
product
github.com /zeroscience
issue-tracking
vulncheck.com /advisories/brightsign-digital-signage-diagnostic-web-server-unauthenticated-ssrf
third-party-advisory

Sources

CVE List CVE-2020-36884
NVD CVE-2020-36884

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary