CVE-2025-34261 Advantech WISE-DeviceOn Server < 5.4 Authenticated Stored XSS via devicegroups/

Q: What is CVE-2025-34261?

CVE-2025-34261 is a medium-severity cross-site scripting vulnerability in Advantech Co., Ltd. WISE-DeviceOn Server, published on 5 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Q: Is CVE-2025-34261 being exploited?

There is no known exploitation of CVE-2025-34261 in the wild and no public exploit code.

Q: How do I fix CVE-2025-34261?

No fix has been published for CVE-2025-34261 yet. Limit exposure of the affected software until one is available.

Medium 5.1 Published 5 Dec 2025 Updated 14 Aug 2026

Authenticated attackers can inject malicious scripts into device group fields, leading to session compromise and unauthorized actions for other users.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-34261?

CVE-2025-34261 is a medium-severity cross-site scripting vulnerability in Advantech Co., Ltd. WISE-DeviceOn Server, published on 5 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the /rmm/v1/devicegroups/ endpoint. When an authenticated user creates a device group, the name and description values are stored and later rendered in device group listings without proper HTML sanitation. An attacker can inject malicious script into either field, which is then executed in the browser context of users who view or interact with the affected device group, potentially enabling session compromise and unauthorized actions as the victim.

Weakness: CWE-79

Which versions are affected by CVE-2025-34261?

It affects 1 product.

Products include Advantech Wise-Deviceon Server.

How do I fix CVE-2025-34261?

No fix has been published for CVE-2025-34261 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-2025-34261 being exploited?

There is no known exploitation of CVE-2025-34261 in the wild and no public exploit code.

Sources

Also known as GHSA-54mr-945x-r486.