#VU105790 Embedded malicious code (backdoor) in changed-files - CVE-2025-30066
Vulnerability identifier: #VU105790
Vulnerability risk: High
CVSSv4.0: 7.7 [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: Network
Exploit availability: Yes
Vulnerable software:
changed-files
Other software /
Other software solutions
Vendor: tj-actions
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.
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versions
changed-files: 1.0.0 - 46.0.1
External links
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://github.com/tj-actions/changed-files/issues/2463
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
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
