CVE-2026-25527
Directory Traversal in changedetection.io Allows Unauthenticated File Read
Publication date: 2026-02-19
Last updated on: 2026-02-19
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| webtechnologies | changedetection | to 0.53.2 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-22 | The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The vulnerability exists in changedetection.io versions prior to 0.53.2. The application has a route `/static/<group>/<filename>` that improperly accepts a group parameter with the value "..". This causes the function `send_from_directory("static/..", filename)` to execute, which moves the base directory up to `/app/changedetectionio`. As a result, an attacker can read local application source files without authentication, such as `flask_app.py`.
How can this vulnerability impact me? :
This vulnerability allows unauthenticated attackers to read local files within the application directory. This can lead to exposure of sensitive source code and potentially other sensitive information stored in the application files. Such information disclosure can aid attackers in further exploiting the system or understanding its inner workings.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade changedetection.io to version 0.53.2 or later, as this version fixes the issue with directory traversal allowing unauthenticated local file read.