CVE-2026-25527
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Directory Traversal in changedetection.io Allows Unauthenticated File Read

Publication date: 2026-02-19

Last updated on: 2026-02-19

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-02-19
Last Modified
2026-02-19
Generated
2026-07-06
AI Q&A
2026-02-19
EPSS Evaluated
2026-07-05
NVD
CVE-2026-25527
EUVD
EUVD-2026-7968

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
webtechnologies changedetection to 0.53.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

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`.

Impact Analysis

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.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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.

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