What’s Vulnerable › Vulnerabilities

CVE-2026-25527: changedetection.io vulnerable to unauthenticated static path traversal

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-19 · updated 2026-06-17
• Weakness: CWE-22

Description

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 products

• dgtlmoon changedetection.io: before 0.53.2 — fixed in 0.53.2

How to fix

Upgrade to a fixed version: dgtlmoon changedetection.io 0.53.2. Check the vendor advisory for mitigations.

References

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

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