6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-29038

CVE-2026-29038: changedetection.io: Reflected XSS in RSS Tag Error Response

changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected 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. This issue has been patched in version 0.54.4.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-29038

CVE-2026-29038:

6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
changedetection.io	pip	< 0.54.4	0.54.4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability exists in the /rss/tag/ endpoint, where the tag_uuid path parameter is reflected in the response without proper escaping. The provided commit patch for CVE-2026-29038 clearly shows the change in changedetectionio/blueprint/rss/tag.py within the construct_tag_routes function. The route for the rss_tag_feed function was changed from accepting a generic <string:tag_uuid> to a more restrictive <uuid_str:tag_uuid>. This change acts as a mitigation by ensuring that only UUIDs are accepted in the path, thus preventing the injection of malicious HTML and script content. The vulnerable code, as described in the advisory, is within the rss_tag_feed function where the unvalidated tag_uuid is returned in an error message. Therefore, rss_tag_feed is the vulnerable function.

Vulnerable functions

rss_tag_feed

changedetectionio/blueprint/rss/tag.py

The `tag_uuid` path parameter is reflected directly in the HTTP response body without HTML escaping. The patch mitigates this by changing the route parameter type from `string` to `uuid_str`, thus preventing arbitrary strings from being injected.

Vulnerability Intelligence
Miggo AI

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WAF Rule

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Reasoning

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