CVE-2026-12496

Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server

State: Published
Severity: 8.7 High
Published: Jul 24, 2026
Updated: Jul 24, 2026
Reserved: Jun 17, 2026

Description

Stored Cross-Site Scripting (CWE-79) in the OPC XML-DA server statistics in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an unauthenticated remote attacker to execute arbitrary JavaScript in an administrator's browser (session hijacking, credential theft, device reconfiguration) via a crafted `User-Agent` header in a `POST /da` request.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	NCSC.ch

Weaknesses

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
CWE-116 Improper encoding or escaping of output

Affected Products

Product	Versions
LIP-ME20xCLoytec	8.4.16 and earlierAffected
L-INXLoytec	8.4.16 and earlierAffected
L-GATELoytec	8.4.16 and earlierAffected
L-ROCLoytec	8.4.16 and earlierAffected
L-IOBLoytec	8.4.16 and earlierAffected
L-DALILoytec	8.4.16 and earlierAffected
L-VISLoytec	8.4.16 and earlierAffected
L-PADLoytec	8.4.16 and earlierAffected

References

https://www.loytec.com/support/product-security/advisories/8522-dibt-cve-20260526-0004-unauthenticated-stored-xxs-in-opc-xml-da-server-statistics-highvendor-advisory

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