CVE-2026-12496: Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-24 · updated 2026-07-27
Weakness: CWE-79

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.

Affected products

Loytec L-DALI: through 8.4.16
Loytec L-GATE: through 8.4.16
Loytec L-INX: through 8.4.16
Loytec L-IOB: through 8.4.16
Loytec L-PAD: through 8.4.16
Loytec L-ROC: through 8.4.16
Loytec L-VIS: through 8.4.16
Loytec LIP-ME20xC: through 8.4.16

References

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

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