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CVE-2026-55730— Loytec LWEB802: Reflected Cross-Site Scripting in LWEB802

Quick assessment

Affected
Loytec LWEB-802
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LOYTEC LWEB-802是LOYTEC公司的一款自动化控制网关。 LOYTEC LWEB-802 5.0.8之前版本存在安全漏洞，该漏洞源于存在反射型跨站脚本，可能导致未经身份验证的远程攻击者通过包含恶意 或 参数的精心构造链接，在受害者浏览器中执行任意JavaScript并以受害者权限执行操作。

CVSS 8.7 · High EPSS 0.61% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
Loytec LWEB-802 < 5.0.8 affected
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I. Basic Information for CVE-2026-55730

Vulnerability Information
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Vulnerability Title
Loytec LWEB802: Reflected Cross-Site Scripting in LWEB802
Source: CVE Program / CVE List V5
Vulnerability Description
Reflected Cross-Site Scripting (CWE-79) in LWEB802 in Loytec LWEB-802 before 5.0.8 on all platforms allows an unauthenticated remote attacker to execute arbitrary JavaScript in a victim's browser and perform actions with the victim's privileges via a crafted link containing a malicious `project` or `mspParams` parameter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
LOYTEC LWEB-802 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LOYTEC LWEB-802是LOYTEC公司的一款自动化控制网关。 LOYTEC LWEB-802 5.0.8之前版本存在安全漏洞，该漏洞源于存在反射型跨站脚本，可能导致未经身份验证的远程攻击者通过包含恶意`project`或`mspParams`参数的精心构造链接，在受害者浏览器中执行任意JavaScript并以受害者权限执行操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Loytec LWEB-802 0 ~ 5.0.8 -

II. Public POCs for CVE-2026-55730

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III. Intelligence Information for CVE-2026-55730

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Vendor Advisories for CVE-2026-55730 (1)

Same Patch Batch · Loytec · 2026-07-24 · 9 CVEs total

CVE-2026-12503 9.2 CRITICAL Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
CVE-2026-12496 8.7 HIGH Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server
CVE-2026-55732 8.7 HIGH Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)
CVE-2026-12502 8.4 HIGH Loytec LINX firmware: Improper Privilege Management in /usr/bin/ltsudo
CVE-2026-12504 8.4 HIGH Loytec LINX firmware: Improper Authentication in PAM configuration
CVE-2026-55729 7.7 HIGH Loytec LWEB802: Exposure of Sensitive Information in browser localStorage
CVE-2026-55731 6.6 MEDIUM Loytec LINX firmware: Unchecked input for loop condition in the SNMP agent
CVE-2026-55728 3.8 LOW Loytec LINX firmware: Stack-based Buffer Overflow in cmd_ipaddr_conflict

IV. Related Vulnerabilities

Same product: LWEB-802
Same vendor: Loytec
Same weakness: CWE-79