dgtlmoon changedetection.io up to 0.54.0 HTTP Response cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in dgtlmoon changedetection.io up to 0.54.0. This vulnerability affects unknown code of the component HTTP Response Handler. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-27645. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in dgtlmoon changedetection.io up to 0.54.0. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component HTTP Response Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-27645 since 02/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 0.54.1 eliminates this vulnerability. Applying the patch a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5 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.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-8621). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• dgtlmoon

Name

• changedetection.io

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50
• 0.51
• 0.52
• 0.53
• 0.54.0

License

• open-source

Website

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

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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