Embedded malicious code (backdoor) in changed-files - CVE-2025-30066
Published: March 17, 2025 / Updated: March 18, 2025
Vulnerability identifier: #VU105790
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2025-30066
CWE-ID: CWE-506
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: tj-actions
Affected software:
changed-files
changed-files
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to sensitive information.
The vulnerability exists due to presence of embedded malicious functionality in the application code (aka backdoor). A remote attacker can discover secrets by reading actions logs.
Note, the vulnerability is being exploited in the wild.
How to mitigate CVE-2025-30066
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Sources
- https://github.com/chains-project/maven-lockfile/pull/1111
- https://github.com/espressif/arduino-esp32/issues/11127
- https://github.com/github/docs/blob/962a1c8dccb8c0f66548b324e5b921b5e4fbc3d6/content/actions/security-for-github-actions/security-guides/security-hardening-for-github-actions.md?plain=1#L191-L193
- https://github.com/modal-labs/modal-examples/issues/1100
- https://github.com/rackerlabs/genestack/pull/903
- https://github.com/tj-actions/changed-files/blob/45fb12d7a8bedb4da42342e52fe054c6c2c3fd73/README.md?plain=1#L20-L28
- https://github.com/tj-actions/changed-files/issues/2463
- https://github.com/tj-actions/changed-files/issues/2464
- https://github.com/tj-actions/changed-files/issues/2477
- https://news.ycombinator.com/item?id=43367987
- https://news.ycombinator.com/item?id=43368870
- https://semgrep.dev/blog/2025/popular-github-action-tj-actionschanged-files-is-compromised/
- https://sysdig.com/blog/detecting-and-mitigating-the-tj-actions-changed-files-supply-chain-attack-cve-2025-30066/
- https://web.archive.org/web/20250315060250/
- https://www.stepsecurity.io/blog/harden-runner-detection-tj-actions-changed-files-action-is-compromised
- https://www.stream.security/post/github-action-supply-chain-attack-exposes-secrets-what-you-need-to-know-and-how-to-respond
- https://www.sweet.security/blog/cve-2025-30066-tj-actions-supply-chain-attack
- https://www.wiz.io/blog/github-action-tj-actions-changed-files-supply-chain-attack-cve-2025-30066