CVE-2026-57916 Arbitrary Path Execution via CPS URI in proCertum SmartSign
Attackers can execute arbitrary code or open malicious URLs by crafting a certificate with a malicious CPS URI, affecting proCertum SmartSign users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-57916?
CVE-2026-57916 is a medium-severity path traversal vulnerability in Asseco proCertum SmartSign, published on 27 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
proCertum SmartSign opens Certificate Practice Statement (CPS) URI without schema validation. An attacker can prepare arbitrary certificate with CPS URI pointing to a local executable file or any URL, sign a document with it, and send it to the victim. When the victim opens the document in the application, the specified file will be executed (or webpage will be opened).
This issue was fixed in version 9.4.3.90.
Weakness: CWE-73
Which versions are affected by CVE-2026-57916?
How do I fix CVE-2026-57916?
No fix has been published for CVE-2026-57916 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-57916 being exploited?
There is no known exploitation of CVE-2026-57916 in the wild and no public exploit code.
Sources
Also known as GHSA-m7cq-h27p-hwp4.