VulnerabilityPublished 8 Mar 2026Updated 11 Mar 2026

CVE-2026-3716: Wavlink WL-WN579X3-C · Cross-site Scripting

Affects Wavlink WL-WN579X3-CSource CVE Database V5

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Public exploit available · CVSS 4.8 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score

4.8Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: High
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: High: The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
WavlinkWL-WN579X3-C	Affected =231124	Fixed in–

AI-suggested

To mitigate CVE-2026-3716, organizations should immediately upgrade affected Wavlink WL-WN579X3-C devices to firmware version 20260226 or later, which contains the necessary input validation fixes. Network administrators should restrict access to the router's management interface by implementing network segmentation and access control lists (ACLs) to limit exposure to trusted hosts only. Employing web application firewalls (WAFs) or intrusion prevention systems (IPS) that can detect and block XSS payloads targeting the management interface can provide additional protection. Regularly auditing router configurations and monitoring administrative access logs can help detect suspicious activity indicative of exploitation attempts. Educating administrators about the risks of clicking on untrusted links or visiting suspicious URLs related to device management interfaces is also critical. Finally, vendors and organizations should adopt secure coding practices and conduct thorough security testing of embedded web interfaces to prevent similar vulnerabilities in future firmware releases.

Description

A vulnerability was determined in Wavlink WL-WN579X3-C 231124. This vulnerability affects the function sub_401AD4 of the file /cgi-bin/adm.cgi. Executing a manipulation of the argument Hostname can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 20260226 is able to resolve this issue. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Impact

The primary impact of this vulnerability is the potential compromise of administrative sessions on affected Wavlink WL-WN579X3-C routers. An attacker exploiting this XSS flaw could execute arbitrary JavaScript in the context of the router's web management interface, potentially stealing session cookies, redirecting administrators to malicious sites, or performing unauthorized configuration changes. This could lead to loss of device integrity and control, enabling further network compromise or persistent access. While the vulnerability does not directly affect confidentiality or availability, the indirect consequences could be severe in environments relying on these routers for network security and management. Organizations with exposed or poorly segmented management interfaces are at higher risk. The medium CVSS score reflects the moderate ease of exploitation combined with limited scope of impact. However, the presence of publicly available exploit details increases the urgency for remediation to prevent targeted attacks, especially in enterprise or critical infrastructure networks using this hardware.

Summary

CVE-2026-3716 identifies a cross-site scripting (XSS) vulnerability in the Wavlink WL-WN579X3-C router firmware version 231124. The flaw exists in the sub_401AD4 function within the /cgi-bin/adm.cgi CGI script, where the Hostname parameter is not properly sanitized before being reflected in the web interface. This allows a remote attacker to inject malicious JavaScript code by manipulating the Hostname argument, which can execute in the context of the administrator's browser session. The attack vector is remote and does not require authentication, but successful exploitation depends on user interaction, such as an administrator accessing a crafted URL or page. The vulnerability could lead to session hijacking, credential theft, or unauthorized actions performed with the administrator's privileges. The vendor responded promptly by releasing an updated firmware version 20260226 that properly sanitizes input and mitigates the XSS issue. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, but user interaction is necessary, with limited impact on integrity and no impact on confidentiality or availability. No known exploits are currently active in the wild, but public disclosure increases the risk of exploitation attempts. This vulnerability highlights the importance of secure input validation in embedded device web interfaces, especially for administrative functions.

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Affected software

Description

AI analysisMachine-generated, updated 15 Mar 2026, 09:10 UTC

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