CVE-2026-55730Network attack vector

Browser script execution via unencoded URL parameters

Published Jul 24, 2026 · Updated Jul 24, 2026

Reflected XSS in LOYTEC LWEB-802 before 5.0.8 allows remote attackers to run JavaScript in a victim's browser via a crafted link. The project and mspParams URL parameters are reflected into generated page output without proper encoding, causing attacker-controlled script to execute in the LWEB-802 origin. No attacker account is required, but a victim must open the link; the script can perform application actions with that victim's privileges.

CVSS severity8.7
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in LOYTEC LWEB-802 before 5.0.8 allows remote attackers to run JavaScript in a victim's browser via a crafted link. The project and mspParams URL parameters are reflected into generated page output without proper encoding, causing attacker-controlled script to execute in the LWEB-802 origin. No attacker account is required, but a victim must open the link; the script can perform application actions with that victim's privileges.

The record

CVE
CVE-2026-55730
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
LOYTEC
Product
LWEB-802
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LOYTEC · LWEB-802version=0 <5.0.8

Published CVSS scores

8.7INCIBE-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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