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VulnerabilityPublished Updated

CVE-2025-4412: SparkLabs Viscosity · Incorrect Default Permissions

Affects SparkLabs ViscositySource CVE Database V5

0

Not known to be exploited · CVSS 4.8 Medium : upgrade to 1.11.5 when convenient.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 4.0 base score
4.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.11.5
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade SparkLabs Viscosity to 1.11.5.

Affected software

ProductAffectedFixed in
SparkLabs ViscosityAffected
  • <1.11.5
Fixed in
  • 1.11.5

AI-suggested

European organizations should take the following specific actions to mitigate CVE-2025-4412: 1) Immediately upgrade all macOS installations of Viscosity to version 1.11.5 or later, where the vulnerability is fixed. 2) Implement strict endpoint security controls to prevent unauthorized local access, including enforcing strong user authentication, limiting administrative privileges, and using endpoint detection and response (EDR) tools to monitor for suspicious dynamic library loading or process injection activities. 3) Audit and restrict the use of Launch Agents and other mechanisms that can load processes or libraries with elevated TCC identities. 4) Educate users about the risks of granting file permissions and monitor file access logs for anomalies. 5) Employ application whitelisting to prevent unauthorized dynamic libraries from loading within Viscosity or other critical applications. 6) Regularly review and update macOS privacy and security settings to ensure that only necessary permissions are granted to applications. 7) Maintain an inventory of macOS endpoints running Viscosity to ensure timely patching and compliance. These measures go beyond generic advice by focusing on controlling local access vectors, monitoring dynamic library usage, and enforcing strict permission management aligned with the vulnerability's technical specifics.

Description

On macOS systems, by utilizing a Launch Agent and loading the viscosity_openvpn process from the application bundle, it is possible to load a dynamic library with Viscosity's TCC (Transparency, Consent, and Control) identity. The acquired resource access is limited without entitlements such as access to the camera or microphone. Only user-granted permissions for file resources apply. Access to other resources beyond granted-permissions requires user interaction with a system prompt asking for permission. This issue was fixed in version 1.11.5 of Viscosity.

References

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