Critical Vulnerability in Web Signer Affects Multiple OS Versions
Severity: High (Score: 72.0)
Sources: www.disig.sk, qesportal.sk
Published: · Updated:
Keywords: signer, upozorňujeme, starších, verziách, aplikácie, určenej, operačné
Summary
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. Key Points: • 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.
Detailed Analysis
**Impact** Users of the Web Signer application versions 2.0.3 through 2.5.3 on Windows, macOS, and Linux operating systems are affected. The vulnerability potentially exposes a broad user base across multiple platforms, impacting any sector relying on this software for digital signing. No specific data types or sectors are detailed in the sources. The operational consequence includes the risk of compromised digital signature integrity or unauthorized access through the vulnerable application. **Technical Details** The vulnerability was identified by Marek Alakš from Binary House but no CVE identifier or specific attack vector is provided. The affected versions are 2.0.3 to 2.5.3, with the issue resolved in version 2.5.5. No information on exploitation techniques, malware, or infrastructure is available from the articles. Indicators of compromise (IOCs) and kill chain details are not mentioned. **Recommended Response** Users should immediately update Web Signer to version 2.5.5. The application will prompt automatic updates shortly, but manual update can be initiated via the system tray icon by selecting “Check for updates.” Updated installation packages are also available on the official websites. No additional detection or mitigation measures are specified; monitoring for update prompts and ensuring timely patch application is advised.
Source articles (2)
- News — qesportal.sk · 2026-06-02
upozorňujeme vás, že v starších verziách aplikácie Web Signer (2.0.3 - 2.5.3) určenej pre operačné systémy Windows, macOS a Linux bola expertom zo spoločnosti Binary House , p. Marekom Alakšom, identi… - Dolezita Aktualizacia Aplikacie Web Signer — www.disig.sk · 2026-06-02
upozorňujeme vás, že v starších verziách aplikácie Web Signer (2.0.3 – 2.5.3) určenej pre operačné systémy Windows, macOS a Linux bola expertom zo spoločnosti Binary House , p. Marekom Alakšom, identi…
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.
- 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.