CVE-2026-8931

Critical RCE vulnerability in Disig Web Signer

CVSS 9.4 CRITICALEPSS 0.7%CWE-94

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.4EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

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

Affected products

Disig · Web Signer

References

https://download.disigcdn.sk/cdn/products/websigner2/changelog.en.txt https://download.disigcdn.sk/cdn/products/websigner2/changelog.sk.txt https://qesportal.sk/Portal/en/Info/News#websigner255 https://qesportal.sk/Portal/sk/Info/News#websigner255 https://www.disig.sk/en/news/important-update-of-the-web-signer-application/https://www.disig.sk/sk/aktuality/dolezita-aktualizacia-aplikacie-web-signer/