CVE-2025-40566 Security feature bypass in SIMATIC PCS neo V4.1
Attackers can reuse session tokens after logout to hijack legitimate user sessions in Siemens SIMATIC PCS neo.
- 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-2025-40566?
CVE-2025-40566 is a high-severity vulnerability in Siemens SIMATIC PCS neo V4.1, published on 13 May 2025. 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
A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions < V4.1 Update 3), SIMATIC PCS neo V5.0 (All versions < V5.0 Update 1). Affected products do not correctly invalidate user sessions upon user logout. This could allow a remote unauthenticated attacker, who has obtained the session token by other means, to re-use a legitimate user's session even after logout.
Weakness: CWE-613
Which versions are affected by CVE-2025-40566?
It affects 1 product.
Products include Siemens Simatic Pcs Neo.
How do I fix CVE-2025-40566?
No fix has been published for CVE-2025-40566 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-40566 being exploited?
There is no known exploitation of CVE-2025-40566 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC PCS neo V4.1
Sources
Also known as GHSA-wmm5-59wm-x34p.