USN-8555-1: Ubuntu Advantage Tools (pro client) vulnerabilities

unknownCVE-2026-9494 CVE-2026-11386 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

vendor: Ubuntu product: Ubuntu Advantage Tools Information disclosure Code injectionOtheraffected: 16.04 LTS, 18.04 LTS, 20.04 LTS

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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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-16
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8555-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-94940.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
Low exploitation riskCVE-2026-113860.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all scored CVEs.
Low exploitation riskCVE-2026-123910.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-9494	coverage & exploitation status	NVD · CVE.org
CVE-2026-11386	coverage & exploitation status	NVD · CVE.org
CVE-2026-12391	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.