CVE-2026-12496 Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server
Unauthenticated attackers can inject JavaScript via User-Agent headers to hijack admin sessions and reconfigure Loytec LINX devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-12496?
CVE-2026-12496 is a high-severity cross-site scripting vulnerability in Loytec L-DALI, published on 24 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-12496?
How do I fix CVE-2026-12496?
No fix has been published for CVE-2026-12496 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-12496 being exploited?
There is no known exploitation of CVE-2026-12496 in the wild and no public exploit code.
Sources
Also known as GHSA-x8xh-f974-3f3h.