Masked variable vulnerability in Runner version 13.9.0-rc1

A vulnerability in GitLab's CI system exposed masked CI variables during specific periods in February 2023, affecting users who ran pipelines with certain runner versions. The issue primarily impacted users on GitLab.com using shared runners and self-managed customers who deployed runner version 13.9.0-rc1. The vulnerability allowed masked variables to be printed in build logs, compromising their secrecy. GitLab recommends affected users review their jobs for printed variables and rotate any exposed secrets, with specific guidance for both GitLab.com and self-managed users about upgrading or downgrading their runner versions. The company has communicated directly with potentially affected users via email and advises users to subscribe to security alerts for future updates.

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