# CVE-2026-25527: dgtlmoon changedetection.io path traversal in static content route

Source: https://junglewise.ai/threats/cve-2026-25527-dgtlmoon-changedetection-io-path-traversal-in-static-content  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-20. Updated: 2026-07-20  
License: CC BY 4.0 with a link back

CVE-2026-25527 · Severity: medium · CVSS 5.3 · Published 2026-07-20

changedetection.io, a tool used for monitoring website changes, is vulnerable to an unauthorized file access flaw. An attacker can exploit this to read the application's internal source code files without needing a password. This could allow unauthorized parties to study the application's logic to find further weaknesses or sensitive configuration details.

Technologies: [changedetection.io (PyPI)](https://junglewise.ai/threats/technologies/changedetection-io). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-25527 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25527 being exploited in the wild.

**How severe is CVE-2026-25527?** Medium severity, with a CVSS score of 5.3, published 20 July 2026.

**Which products and versions are affected?** changedetection.io (PyPI) < 0.53.2, ECOSYSTEM:introduced=0,fixed=0.53.2.

**Is there a fix for CVE-2026-25527?** Yes. changedetection.io (PyPI): upgrade to 0.53.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-25527 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-25527?** Check whether you run changedetection.io (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- changedetection.io (PyPI): upgrade to 0.53.2 or later

  ```sh
  pip install "changedetection.io>=0.53.2"
  ```


## Technical details

A path traversal vulnerability exists in the `/static/<group>/<filename>` route of changedetection.io due to insufficient input sanitization in `flask_app.py`. The `group` parameter is processed using a regular expression that allows dots, enabling an attacker to use `..` to traverse up from the intended `static/` directory. By setting `group` to `..`, the `send_from_directory` function executes relative to the application root, allowing unauthenticated remote attackers to read internal Python source files (e.g., `flask_app.py`). The exploit is limited to the application package directory as the `filename` parameter rejects slashes, preventing access to arbitrary system files like `/etc/passwd`. This issue is resolved in version 0.53.2.

## Affected products

- dgtlmoon changedetection.io < 0.53.2

## Identifiers

- CVE-2026-25527
- GHSA-9jj8-v89v-xjvw
- PYSEC-2026-2124

## Timeline

- 2026-02-16: disclosed: Initial disclosure by reporter
- 2026-02-19: advisory: NVD publication date
- 2026-07-20: patched: GitHub Advisory published and reviewed

## References

- [https://api.github.com/users/minnggyuu](https://api.github.com/users/minnggyuu)
- [https://github.com/minnggyuu](https://github.com/minnggyuu)
- [https://api.github.com/users/minnggyuu/gists%7B/gist_id%7D](https://api.github.com/users/minnggyuu/gists%7B/gist_id%7D)
- [https://api.github.com/users/minnggyuu/repos](https://api.github.com/users/minnggyuu/repos)
- [https://avatars.githubusercontent.com/u/154591990?v=4](https://avatars.githubusercontent.com/u/154591990?v=4)
- [https://api.github.com/users/minnggyuu/events%7B/privacy%7D](https://api.github.com/users/minnggyuu/events%7B/privacy%7D)

## Related threats

- [PYSEC-2026-1241 - ChangeDetection.io XSS in watch overview](https://junglewise.ai/threats/cve-2025-52558-changedetection-io-xss-in-watch-overview)
- [PYSEC-2026-1242 - changedetection.io Vulnerable to Improper Input Validation Leading to LFR/Path Traversal](https://junglewise.ai/threats/cve-2024-56509-changedetection-io-vulnerable-to-improper-input-validation)
- [PYSEC-2026-1239 - changedetection.io path traversal using file URI scheme without supplying hostname](https://junglewise.ai/threats/cve-2024-51998-changedetection-io-path-traversal-using-file-uri-scheme-without)
- [PYSEC-2026-1240 - changedetection.io Path Traversal](https://junglewise.ai/threats/cve-2024-51483-changedetection-io-path-traversal)
- [PYSEC-2026-1243 - changedetection.io Cross-site Scripting vulnerability](https://junglewise.ai/threats/cve-2024-34061-changedetection-io-cross-site-scripting-vulnerability)