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Critical Vulnerability in Web Signer Affects Multiple OS Versions

Critical Vulnerability in Web Signer Affects Multiple OS Versions

First seen 2 Jun 2026, 01:27 UTC • •
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ThreatCluster AI
ThreatCluster •June 3, 2026 at 00:05 UTC
  • •A critical vulnerability in Web Signer affects versions 2.0.3 to 2.5.3.
  • •The flaw was identified by Marek Alakš from Binary House and patched in version 2.5.5.
  • •Users are urged to update immediately to avoid potential exploitation.

A serious vulnerability has been identified in older versions of the Web Signer application (2.0.3 - 2.5.3) for Windows, macOS, and Linux. The flaw was discovered by Marek Alakš from Binary House and has been patched in version 2.5.5. Users are advised to update their applications immediately, as the application will prompt for an update shortly. Manual updates can also be initiated by right-clicking the yellow icon in the system tray. The vulnerability poses risks to all users of the affected versions, necessitating swift action to mitigate potential exploitation. The updated installation packages are available on the vendor's website.

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Timeline

2026-06-02
Vulnerability identified in Web Signer
Marek Alakš from Binary House discovered a serious vulnerability in Web Signer versions 2.0.3 - 2.5.3, affecting multiple operating systems.
qesportal.sk
2026-06-02
Patch released for Web Signer
Version 2.5.5 of Web Signer was released to address the identified vulnerability, with users advised to update immediately.
www.disig.sk

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