CVE-2026-78403

CRITICAL 9.8CVE-2026-78403 · Published 30/10/2026 · updated 02/11/2026

In short

CVE-2026-78403 is a CRITICAL (CVSS 9.8) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.58%, higher than 47.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

Description

Stack-based buffer overflow and missing authorization vulnerability in Thales Sentinel Keys Server on Windows allows Overflow Buffers. Sentinel Keys Server does not check the length of the first field in the HTTP request. An attacker may craft an HTTP request and send it to Sentinel Keys Server. It may lead to remote code execution as NT AUTHORITY\SYSTEM. This issue affects Sentinel Keys Server: versions lower than 1.3.8.0.

References

supportportal.thalesgroup.com/csm

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free