CVE-2026-44479: Vercel: Non-interactive mode includes CLI arguments in suggested command output
Summary
When the Vercel CLI runs in non-interactive mode (--non-interactive or auto-detected AI agent), commands that cannot complete autonomously emit JSON payloads with suggested follow-up commands. If the user authenticated via --token or -t on the command line, the token value is included verbatim in those suggestions.
Conditions
All three must be true for the token to appear in output:
1. Token passed as a CLI argument (--token / -t). The VERCELTOKEN environment variable is not affected. 2. Non-interactive mode is active (explicit flag or AI agent auto-detection). 3. The command cannot complete on its own (e.g. missing --yes, ambiguous scope, API errors). Successful commands produce no suggestion output.
Impact
The plaintext token may be captured in CI/CD logs, agent transcripts, or other automation output.
Remediation
- Upgrade to the patched version. - If developers have previously used --token with --non-interactive in their applications, review logs for exposed tokens and rotate them. - Prefer VERCELTOKEN environment variable for authentication.
Other sources
Vercel’s AI Cloud is a unified platform for building modern applications. From 50.16.0 to 52.0.0, hen the Vercel CLI runs in non-interactive mode (--non-interactive or auto-detected AI agent), commands that cannot complete autonomously emit JSON payloads with suggested follow-up commands. If the user authenticated via --token or -t on the command line, the token value is included verbatim in those suggestions. The plaintext token may be captured in CI/CD logs, agent transcripts, or other automation output. This vulnerability is fixed in 52.0.1.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-44479?
The severity of CVE-2026-44479 is currently classified as moderate due to the potential exposure of sensitive token data.
How do I fix CVE-2026-44479?
To fix CVE-2026-44479, upgrade the vercel package to version 52.0.1 or higher.
What software is affected by CVE-2026-44479?
CVE-2026-44479 affects the vercel package versions between 50.16.0 and 52.0.0 on npm.
What are the risks associated with CVE-2026-44479?
The risks associated with CVE-2026-44479 include potential leakage of sensitive token values in JSON payloads when using non-interactive commands.
Is authentication with the token secure in scenarios affected by CVE-2026-44479?
Authentication with the token is not secure in the affected scenarios, as the token value may be exposed in output payloads.