CVE-2026-12391
Bilal Teke discovered that Ubuntu Advantage Tools exposed the Pro bearer token in command-line arguments when validating APT credentials. A local attacker could possibly use this issue to obtain sensitive information and gain unauthorized access to Ubuntu Pro repositories. (CVE-2026-9494) Frederick Jerusha discovered that Ubuntu Advantage Tools did not properly validate data received from the contract server when writing APT source files. An attacker could possibly use this issue to inject arbitrary APT configuration and execute arbitrary code. (CVE-2026-11386) Mateusz Gierblinski discovered that Ubuntu Advantage Tools did not properly handle symbolic links when collecting diagnostic logs. A local attacker could possibly use this issue to obtain sensitive information from files owned by the administrator. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-12391)
CSIRTS triage
- What
- Vulnerabilities in Ubuntu Advantage Tools could expose sensitive information and allow arbitrary code execution.
- Who is affected
- Local attackers on Ubuntu Advantage Tools versions 16.04 LTS, 18.04 LTS, and 20.04 LTS are affected.
- Urgency
- The urgency is unclear, but the vulnerabilities could lead to unauthorized access and code execution.
- Action
- Users should review the advisories and apply any available patches.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (3)
- high[NEW] [high] Ubuntu Linux (ubuntu-pro-client): Multiple vulnerabilitiescert-bund · 2026-07-17
- mediumCVE-2026-12391: An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ub…nvd · 2026-07-16
- unknownUSN-8555-1: Ubuntu Advantage Tools (pro client) vulnerabilitiesubuntu · 2026-07-16
External references
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