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CVE-2026-55729— Loytec LWEB802: Exposure of Sensitive Information in browser localStorage

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之前版本存在信息泄露漏洞，该漏洞源于浏览器localStorage存储的管理员凭据泄露，可能导致未经身份验证的远程攻击者通过特制链接泄露存储的管理凭据。

CVSS 7.7 · High EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Loytec LWEB-802 < 5.0.8 affected
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I. Basic Information for CVE-2026-55729

Vulnerability Information
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Vulnerability Title
Loytec LWEB802: Exposure of Sensitive Information in browser localStorage
Source: CVE Program / CVE List V5
Vulnerability Description
Exposure of Sensitive Information (CWE-200) in LWEB802 browser `localStorage` in Loytec LWEB-802 before 5.0.8 on all platforms allows an unauthenticated remote attacker to leak stored management credentials via a crafted link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
LOYTEC LWEB-802 信息泄露漏洞
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之前版本存在信息泄露漏洞，该漏洞源于浏览器localStorage存储的管理员凭据泄露，可能导致未经身份验证的远程攻击者通过特制链接泄露存储的管理凭据。
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-2026-55729

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III. Intelligence Information for CVE-2026-55729

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Vendor Advisories for CVE-2026-55729 (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-2026-55730 8.7 HIGH Loytec LWEB802: Reflected Cross-Site Scripting in LWEB802
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-2026-55731 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-200

V. Comments for CVE-2026-55729

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