Vulnerability details

CVE-2026-78403

Thalesgroup Sentinel Keys Server

Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

CVSS 4.0

9.3Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (THA-PSIRT)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (THA-PSIRT)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
Thalesgroup	Sentinel Keys Server	v < 1.3.8.0	CVEProject cvelistV5 (CNA)

References and advisories

https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=50fc9f3b3b005f10bba8b41864e45a61&sysparm_article=KB0031216 vendor-advisory

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Details

Published: 2026-10-30
Last updated: 2026-10-30
State: Published
Assigner (CNA): THA-PSIRT
Kolun priority: 26 · Low

Exploit prediction (EPSS)

0.57%

Probability of exploitation in 30 days

47.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-121
Stack-based buffer overflow
CWE-862
Missing Authorization