CVE-2026-34810: Endian Firewall /cgi-bin/vpnfw.cgi remark Stored Cross-Site Scripting

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-07-24
Weakness: CWE-79

Description

Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/vpnfw.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.

Affected products

Endian Firewall: through 3.3.25

References

https://help.endian.com/hc/en-us/sections/360004371358-Community
https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-vpnfw-cgi-remark-stored-cross-site-scripting

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