MEDIUM5.3

PYSEC-2026-2124

Quick fix

PYSEC-2026-2124 — changedetection-io: upgrade to the fixed version with the command below.

pip install --upgrade 'changedetection-io>=0.53.2'

Details

changedetection.io is a free open source web page change detection tool. In versions prior to 0.53.2, the `/static/<group>/<filename>` route accepts `group=".."`, which causes `send_from_directory("static/..", filename)` to execute. This moves the base directory up to `/app/changedetectionio`, enabling unauthenticated local file read of application source files (e.g., `flask_app.py`). Version 0.53.2 fixes the issue.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/changedetection-io

Introduced in: 0Fixed in: 0.53.2

Fixpip install --upgrade 'changedetection-io>=0.53.2'

References

https://github.com/dgtlmoon/changedetection.io/commit/9d38b4517364831889b5b0d7b3465fd060403fd4[FIX]
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw[EVIDENCE]