What’s Vulnerable › Vulnerabilities

CVE-2026-34821: Endian Firewall /manage/vpnauthentication/user/ remark Stored Cross-Site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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 /manage/vpnauthentication/user/. 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-manage-vpnauthentication-user-remark-stored-cross-site-scripting

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