EUVD-2026-18290
GHSA-8vwx-grx5-9rv6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/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
Lifecycle Timeline
3DescriptionCVE.org
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the dscp parameter to /manage/qos/rules/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
AnalysisAI
Stored cross-site scripting in Endian Firewall 3.3.25 and prior allows authenticated attackers to inject arbitrary JavaScript via the dscp parameter in the QoS rules management interface (/manage/qos/rules/). When other authenticated users view the affected configuration page, the injected script executes in their browser context, enabling session hijacking, credential theft, or lateral movement within the firewall management console. EPSS risk is elevated at moderate severity (CVSS 5.1), and no public exploit code or active exploitation has been confirmed.
Technical ContextAI
This is a stored (persistent) cross-site scripting vulnerability rooted in inadequate input validation and output encoding of the dscp parameter within Endian Firewall's QoS rules management module (CWE-79: Improper Neutralization of Input During Web Page Generation). The vulnerability exists in a web-based management interface that processes Quality of Service configuration settings. The attack vector is network-based with low complexity, requiring only low-privilege authentication (authenticated admin or management user). The stored nature of the XSS means the malicious payload persists in the firewall's configuration database and is reflected to any subsequent user accessing the QoS rules page, creating a multi-user attack surface within the management console.
RemediationAI
Upgrade Endian Firewall to a patched version released after 3.3.25; vendors typically issue incremental releases (e.g., 3.3.26 or later) to address web UI input validation issues. Consult the Endian Help Center and VulnCheck advisory for confirmed patched version availability and release timing. As an interim mitigation, restrict administrative console access to trusted networks via IP whitelisting or firewall rules, limit QoS rule configuration privileges to essential personnel, and conduct audit of existing QoS rule configurations to identify any injected JavaScript in dscp parameters. Apply input validation patches immediately upon vendor release, as stored XSS in administrative interfaces can facilitate privilege escalation and persistent access.
More in Firewall Community
View allEndian Firewall Community (aka EFW) 3.3.2 allows remote authenticated users to execute arbitrary OS commands via shell m
Remote command execution in Endian Firewall Community Edition 3.3.25 and earlier allows authenticated users to inject ar
Remote code execution in Endian Firewall versions ≤3.3.25 allows authenticated users with low privileges to execute arbi
Remote code execution in Endian Firewall 3.3.25 and earlier allows authenticated attackers with low-level privileges to
Remote command execution in Endian Firewall 3.3.25 and earlier allows authenticated attackers to execute arbitrary OS co
Remote command execution in Endian Firewall 3.3.25 and earlier allows authenticated users with low privileges to inject
Remote command execution in Endian Firewall 3.3.25 and earlier allows authenticated users with low privileges to inject
Remote command execution in Endian Firewall Community ≤3.3.25 allows authenticated users to inject OS commands through t
Directory traversal in Endian Firewall 3.3.25 and earlier allows authenticated users to delete arbitrary files through t
Stored cross-site scripting (XSS) in Endian Firewall 3.3.25 and prior allows authenticated attackers to inject arbitrary
Stored cross-site scripting (XSS) in Endian Firewall 3.3.25 and prior allows authenticated attackers to inject arbitrary
Stored cross-site scripting in Endian Firewall 3.3.25 and prior allows authenticated attackers to inject malicious JavaS
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allShare
External POC / Exploit Code
Leaving vuln.today