Threats affecting pkg:github/xygeni/xygeni-action

CVE-2026-31976 is a critical supply chain vulnerability in the GitHub Action 'xygeni-action' used by the Xygeni Scanner. An attacker with compromised GitHub App credentials injected obfuscated malicious shell code into the action.yml file via unmerged pull requests. Although the PRs were blocked, the attacker moved the mutable v5 tag to point to the malicious commit, causing any workflow referencing xygeni/xygeni-action@v5 between March 3 and March 10, 2026, to execute a command-and-control implant. This implant allowed arbitrary command execution on CI runners for up to 180 seconds per workflow run without requiring authentication or user interaction. The vulnerability represents a high-severity supply chain compromise with a CVSS 9.3 score. Organizations using this GitHub Action during the affected window are at risk of remote code execution and potential further compromise of their CI/CD environments.