VulnerabilityPublished 17 Mar 2026

CVE-2026-4354: TRENDnet TEW-824DRU · Cross-site Scripting

Affects TRENDnet TEW-824DRUSource CVE Database V5

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Public exploit available · CVSS 5.1 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score

5.1Medium

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

EPSS: 2.4% chance of exploitation in 30 days – higher than 84% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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: Low
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: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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 17 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
TRENDnetTEW-824DRU	Affected =1.010B01 =1.04B01	Fixed in–

AI-suggested

Immediately restrict access to the router's web interface to trusted networks only, ideally via VPN or secure management VLANs, to reduce exposure to remote attackers.
Disable remote management features if not required to eliminate external attack vectors.
Implement web filtering or endpoint protections that can detect and block malicious scripts or suspicious URLs targeting this vulnerability.
Educate users and administrators about the risks of clicking on unsolicited or suspicious links related to router management interfaces.
Monitor network traffic and logs for unusual access patterns or attempts to exploit the 'Language' parameter in apply_sec.cgi.
If possible, upgrade to newer firmware versions or alternative devices that do not contain this vulnerability, as no patches are currently available.
Employ web application firewalls (WAFs) or intrusion prevention systems (IPS) that can detect and block XSS payloads targeting this router's web interface.
Regularly audit and review router configurations and access controls to ensure minimal exposure.

Description

CVE-2026-4354 is a medium severity cross-site scripting (XSS) vulnerability affecting the web interface of TRENDnet TEW-824DRU routers, specifically versions 1.010B01 and 1.04B01. The vulnerability arises from improper sanitization of the 'Language' parameter in the apply_sec.cgi script, allowing remote attackers to inject malicious scripts. Exploitation does not require authentication but does require user interaction, such as visiting a crafted URL. Although the vendor has not responded to disclosure, no patches are currently available, and public exploits exist. This vulnerability could enable attackers to execute arbitrary scripts in the context of the victim's browser, potentially leading to session hijacking or phishing attacks. Organizations using these router models should be aware of the risk and implement mitigations promptly.

Impact

The primary impact of CVE-2026-4354 is the potential for attackers to execute arbitrary scripts in the context of users accessing the vulnerable router's web interface. This can lead to session hijacking, credential theft, phishing, or unauthorized configuration changes if the attacker can trick users into visiting malicious URLs. For organizations, this could result in compromised network devices, loss of confidentiality of administrative credentials, and potential lateral movement within internal networks. While the vulnerability does not directly allow remote code execution on the device or network disruption, the indirect consequences of successful XSS attacks can be significant, especially in environments where these routers are used as critical network infrastructure. The lack of vendor response and patches increases the window of exposure, raising the risk for affected organizations globally.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Mar 2026, 00:59 UTC

Technical details

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