CVE-2026-8931 PUBLISHED

Critical RCE vulnerability in Disig Web Signer

Assigner: SK-CERT
Reserved: 19.05.2026 Published: 01.06.2026 Updated: 01.06.2026

A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 9.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Vendor	Disig
Product	Web Signer
Versions	Default: unaffected affected from 2.0.3 to 2.5.3 (incl.) Version 2.5.5 is unaffected