UAC < 3.3.0-rc1 Command Injection via Placeholder Substitution
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.
Summary
UAC (Unix-like Artifacts Collector) before 3.3.0-rc1 contains a command injection vulnerability in the placeholder substitution and command execution pipeline where the _run_command() function passes constructed command strings directly to eval without proper sanitization. Attackers can inject shell metacharacters or command substitutions through attacker-controlled inputs including %line% values from foreach iterators and %user% / %user_home% values derived from system files to achieve arbitrary command execution with the privileges of the UAC process.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA UAC (tclahr) Fixed in 3.3.0-rc1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40032
- 2026-10-03 Alias added: GHSA-vv2j-m83f-q33j
References
More tclahr vulnerabilities
- TI-2026-30040 UAC < 3.3.0 Command Injection via User Substitution in parse_artifact.sh CVSS 4.0HIGH 8.5
- TI-2026-30039 UAC < 3.3.0 Command Injection via command_collector.sh CVSS 4.0HIGH 8.5
- TI-2026-30038 UAC < 3.3.0 Command Injection via run_command.sh CVSS 4.0HIGH 8.5
Sources
- CVE-2026-40032 · CVE Program
- CVE-2026-40032 · NVD
- FIRST EPSS
- GHSA-vv2j-m83f-q33j · GitHub Advisory Database · CC BY 4.0
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