dgtlmoon changedetection.io up to 0.54.3 XPath Expression unparsed-text include_filters code injection

Summaryinfo

A vulnerability was found in dgtlmoon changedetection.io up to 0.54.3 and classified as critical. Affected by this issue is the function unparsed-text of the component XPath Expression Handler. The manipulation of the argument include_filters results in code injection. This vulnerability is identified as CVE-2026-29039. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in dgtlmoon changedetection.io up to 0.54.3. Affected is the function unparsed-text of the component XPath Expression Handler. The manipulation of the argument include_filters with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, the changedetection.io application allows users to specify XPath expressions as content filters via the include_filters field. These XPath expressions are processed using the elementpath library which implements XPath 3.0/3.1 specification. XPath 3.0 includes the unparsed-text() function which can read arbitrary files from the filesystem. The application does not validate or sanitize XPath expressions to block dangerous functions, allowing an attacker to read any file accessible to the application process. This issue has been patched in version 0.54.4.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-29039 since 03/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 0.54.4 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 417d57e5749441e4be9acc4010369bded805d66f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• dgtlmoon

Name

• changedetection.io

Version

• 0.54.0
• 0.54.1
• 0.54.2
• 0.54.3

License

• open-source

Website

• Product: https://github.com/dgtlmoon/changedetection.io/

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