Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server
Summary
| CVE | CVE-2026-12496 |
|---|---|
| State | PUBLISHED |
| Assigner | NCSC.ch |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-24 15:17:08 UTC |
| Updated | 2026-07-24 15:17:08 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.003580000 probability, percentile 0.283740000 (date 2026-07-25)
Problem Types: CWE-79 | CWE-116 | CWE-79 CWE-79 Improper neutralization of input during web page generation ('cross-site scripting') | CWE-116 CWE-116 Improper encoding or escaping of output
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 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/E:X/C... |
| 4.0 | CNA | CVSS | 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 |
CVSS v4.0 Breakdown
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Loytec | LIP-ME20xC | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-INX | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-GATE | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-ROC | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-IOB | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-DALI | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-VIS | affected 8.4.16 custom | Not specified |
| CNA | Loytec | L-PAD | affected 8.4.16 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.loytec.com/support/product-security/advisories/8522-dibt-cve-20260526-00... | [email protected] | www.loytec.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Daniel Hulliger, armasuisse CYD Campus (en)
CNA: Damian Pfammatter, armasuisse CYD Campus (en)
Additional Advisory Data
Solutions
CNA: Upgrade to firmware version 8.4.18.