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CVE-2025-30066 — tj-actions changed-files before 46 allows remote attackers to discover secrets by reading…

Key facts

CVE-2025-30066 is a High (8.6) vulnerability: tj-actions changed-files before 46 allows remote attackers to discover secrets by reading…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-03-18), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2025-30066 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-03-18), confirming exploitation in the wild. Federal remediation deadline: 2025-04-08. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2025-30066
Severity High (8.6)
CISA KEV Actively exploited (added 2025-03-18)
Detection / prevention —
PoC poc.py
Source 2025/CVE-2025-30066/

Details

English | 한국어

Description

tj-actions changed-files before 46 allows remote attackers to discover secrets by reading actions logs. (The tags v1 through v45.0.7 were affected on 2025-03-14 and 2025-03-15 because they were modified by a threat actor to point at commit 0e58ed8, which contained malicious updateFeatures code.)

Vulnerability Details

Property Value
CVE ID CVE-2025-30066
CVSS Score 8.6

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2025/CVE-2025-30066/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2025-30066

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • https://blog.gitguardian.com/compromised-tj-actions/
  • 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
  • https://www.cisa.gov/news-events/alerts/2025/03/18/supply-chain-compromise-third-party-github-action-cve-2025-30066
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-30066

Generated by PoC Generator on 2026-07-11T22:32:42.596585313

Frequently asked questions

What is CVE-2025-30066?

CVE-2025-30066 is a High (8.6) vulnerability: tj-actions changed-files before 46 allows remote attackers to discover secrets by reading…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-03-18), confirming active exploitation in the wild.

How do I detect CVE-2025-30066?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2025-30066?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2025-30066 actively exploited?

Yes. CVE-2025-30066 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2025-03-18, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2025-04-08. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.