VulnerabilityPublished 16 Mar 2026

CVE-2026-29520: Shenzhen Hereta Technology Hereta ETH-IMC408M · Cross-site Scripting

Affects Shenzhen Hereta Technology Hereta ETH-IMC408MSource CVE Database V5

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Not known to be exploited · 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: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: Active: Successful exploitation of this vulnerability requires a targeted user to perform specific, conscious interactions with the vulnerable system and the attacker’s payload, or the user’s interactions would actively subvert protection mechanisms which would lead to exploitation of the vulnerability.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Subsequent System.
Subsequent 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 Subsequent 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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), 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
Shenzhen Hereta Technology Co., Ltd.Hereta ETH-IMC408M	Affected <=1.0.15	Fixed in–

AI-suggested

Organizations should immediately restrict access to the management interface of the Hereta ETH-IMC408M device to trusted networks and users only, ideally through network segmentation and firewall rules. Administrators should be trained to recognize and avoid clicking suspicious links, especially those targeting device management interfaces. Implementing web application firewalls (WAFs) that can detect and block reflected XSS payloads targeting the ping_ipaddr parameter may provide additional protection. Monitoring administrative sessions for unusual activity can help detect exploitation attempts. Vendors and users should prioritize firmware updates once patches become available. In the interim, disabling or limiting the use of the Network Diagnosis ping function may reduce exposure. Employing Content Security Policy (CSP) headers where possible can help mitigate the impact of XSS attacks by restricting script execution contexts.

Description

CVE-2026-29520 is a reflected cross-site scripting (XSS) vulnerability in the Hereta ETH-IMC408M device firmware version 1.0.15 and earlier. The flaw exists in the Network Diagnosis ping function, specifically in the ping_ipaddr parameter, which does not properly sanitize user input. Attackers can craft malicious URLs containing JavaScript payloads that execute when an authenticated administrator clicks the link, potentially compromising their session. This vulnerability requires user interaction but no authentication bypass or privileges are needed to trigger the attack. While no known exploits are currently active in the wild, the medium severity CVSS score of 5.1 reflects the moderate risk posed by this vulnerability. Organizations using this device should prioritize input validation and consider restricting access to the management interface. The vulnerability primarily affects deployments of Shenzhen Hereta Technology Co.

Impact

If exploited, this vulnerability could allow attackers to execute arbitrary JavaScript in the context of an authenticated administrator's session, potentially leading to session hijacking, theft of sensitive credentials, or unauthorized administrative actions on the affected device. This could compromise the security and integrity of the network device, leading to broader network compromise or disruption. Since the device is a network management component, attackers gaining control could manipulate network configurations or intercept network traffic. The requirement for user interaction limits the attack scope, but targeted spear-phishing or social engineering campaigns could be effective. Organizations relying on Hereta ETH-IMC408M devices in critical network infrastructure or enterprise environments face risks of unauthorized access and control, which could cascade into larger security incidents.

Summary

The CVE-2026-29520 vulnerability is a reflected cross-site scripting (XSS) issue found in the firmware of the Hereta ETH-IMC408M device, specifically versions 1.0.15 and earlier. The vulnerability arises from improper neutralization of input in the ping_ipaddr parameter of the Network Diagnosis ping function. When an attacker crafts a malicious URL embedding JavaScript code within this parameter, and an authenticated administrator visits the link, the script executes in the context of the administrator's browser session. This can lead to session hijacking, credential theft, or unauthorized actions performed with the administrator's privileges. The vulnerability does not require prior authentication to exploit, but the victim must be an authenticated administrator who clicks the malicious link, making social engineering a likely attack vector. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, but user interaction is necessary. The vulnerability affects the confidentiality and integrity of the administrative session but does not directly impact availability. No patches or official fixes are currently linked, and no exploits have been reported in the wild. The vulnerability is classified under CWE-79, which covers improper input neutralization leading to XSS attacks.

CWE-79Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Mar 2026, 01:01 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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