CVE-2026-34813

EUVD-2026-18308
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the user parameter to /cgi-bin/proxyuser.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
6.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
endianfirewall_community
𝑥
≤ 3.3.25
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
endianfirewall
3.3.25
CNA
Common Weakness Enumeration
References
https://help.endian.com/hc/en-us/sections/360004371358-Community
https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-proxyuser-cgi-user-stored-cross-site-scripting