Vulnerability · Published Jun 1, 2026 · Assigned by SK-CERT
CVE-2026-8931Critical RCE vulnerability in Disig Web Signer
Critical 9.4
In plain English
A critical-severity code injection in Web Signer from Disig. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)0.7%top 45.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Disig | Web Signer | 2.0.3 – through 2.5.3 |
Weakness: CWE-94 · 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
References
- https://www.disig.sk/en/news/important-update-of-the-web-signer-application/
- https://www.disig.sk/sk/aktuality/dolezita-aktualizacia-aplikacie-web-signer/
- 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