CVE-2026-3873 Legacy built-in user account
Attackers can exploit hard-coded credentials in Avantra to access restricted functionality and potentially escalate privileges or read data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3873?
CVE-2026-3873 is a high-severity vulnerability in syslink software AG Avantra, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use of Hard-coded Credentials vulnerability in Avantra allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Avantra: before 25.3.0.
Weakness: CWE-798
Which versions are affected by CVE-2026-3873?
How do I fix CVE-2026-3873?
No fix has been published for CVE-2026-3873 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3873 being exploited?
There is no known exploitation of CVE-2026-3873 in the wild and no public exploit code.
Sources
Also known as GHSA-q26g-448c-9p4x.