Description
NR255-V version 1.5.130703 fails to sanitize QoS rule names before they are parsed via eval() in qos_xianz_add_cgi, qos_xianz_show_cgi, qos_filter_add_cgi, and qos_filter_show_cgi handlers. An attacker can inject persistent script code through crafted QoS rule name input that executes when the stored data is later processed by the affected handlers.'
Published: 2026-09-15
Score: 4.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Stored Cross‑Site Scripting
Action: Apply Patch
AI Analysis

Impact

The router firmware fails to sanitize QoS rule names before they are parsed by eval in several CGI handlers. A crafted rule name containing script code can be stored persistently and later executed when the data is processed. This results in a stored cross‑site scripting vulnerability that exploits a data‑validation weakness identified as CWE‑79. The impact is client web interface; the advisory does not detail specific downstream effects.

Affected Systems

Netcore NR255‑V devices running firmware version 1.5.130703 are affected. Users who add or view QoS rules with unsanitized names risk exposure.

Risk and Exploitability

The CVSS score is 4.8, the EPSS score is less it is not listed in the CISA KEV catalog. Based on the description, it can be inferred that authenticating to the router’s management interface and creating or modifying QoS rules would be necessary to inject malicious payloads, making this a stored XSS scenario. The advisory does not elaborate on concrete exploitation outcomes beyond this behavior.

Generated by OpenCVE AI on September 16, 2026 at 21:21 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update the router firmware to a version that sanitizes QoS rule names and removes the eval usage in the affected handlers.
  • If an update is unavailable, restrict QoS rule names to alphanumeric characters only and avoid script tags access to trusted administrators or block it from the public internet to reduce the attack surface.
  • Apply network segmentation and strong access controls so that only authorized personnel can access the router’s management interface, and monitor logs for any abnormal QoS rule changes.

Generated by OpenCVE AI on September 16, 2026 at 21:21 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 15 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description NR255-V version 1.5.130703 fails to sanitize QoS rule names before they are parsed via eval() in qos_xianz_add_cgi, qos_xianz_show_cgi, qos_filter_add_cgi, and qos_filter_show_cgi handlers. An attacker can inject persistent script code through crafted QoS rule name input that executes when the stored data is later processed by the affected handlers.'
Title Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting via Unescaped QoS Rule Names
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-15T21:57:56.916Z

Reserved: 2026-08-19T21:47:08.936Z

Link: CVE-2026-76864

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-15T22:17:00.990

Modified: 2026-09-16T19:47:01.197

Link: CVE-2026-76864

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T21:30:06Z

Weaknesses
  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')