CVE-2026-12496Network attack vector

Unauthenticated stored XSS via User-Agent statistics

Published Jul 24, 2026 · Updated Jul 24, 2026

Stored XSS in LOYTEC LINX firmware through 8.4.16 allows remote attackers to execute JavaScript in an administrator's browser. The OPC XML-DA server records an unescaped User-Agent header from an unauthenticated POST /da request and later inserts it into the server statistics page. Execution requires an administrator to view those statistics, enabling session-cookie theft or device reconfiguration with that administrator's web 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

Stored XSS in LOYTEC LINX firmware through 8.4.16 allows remote attackers to execute JavaScript in an administrator's browser. The OPC XML-DA server records an unescaped User-Agent header from an unauthenticated POST /da request and later inserts it into the server statistics page. Execution requires an administrator to view those statistics, enabling session-cookie theft or device reconfiguration with that administrator's web privileges.

The record

CVE
CVE-2026-12496
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
LOYTEC
Product
L-GATE
Classifications
CWE-79, T1190
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 <=8.4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LOYTEC · L-GATEversion=0 <=8.4.16
LOYTEC · L-IOBversion=0 <=8.4.16
LOYTEC · L-ROCversion=0 <=8.4.16
LOYTEC · L-INXversion=0 <=8.4.16
LOYTEC · LIP-ME20xCversion=0 <=8.4.16
LOYTEC · L-VISversion=0 <=8.4.16
LOYTEC · L-DALIversion=0 <=8.4.16
LOYTEC · L-PADversion=0 <=8.4.16

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')
T1190Exploit Public-Facing Application

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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