CVE-2026-25527

changedetection.io vulnerable to unauthenticated static path traversal

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.

Affected

dgtlmoon · changedetection.io

CVSS v3.1 GITHUB

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

1.00% chance of exploitation in the next 30 days, 62nd percentile

Nuclei

medium · CWE-22

Published

2026-02-19

Proof-of-concept exploits (1)

• advisories/GHSA-9jj8-v89v-xjvw

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-25527.yaml

Security advisories

• dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw
• dgtlmoon/changedetection.io/commit/9d38b4517364831889b5b0d7b3465fd060403fd4

References

• CVE Record
• NVD entry