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

Source: https://junglewise.ai/threats/cve-2026-29038-changedetection-io-has-reflected-xss-in-its-rss-tag-error  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-06  
License: CC BY 4.0 with a link back

CVE-2026-29038 · Severity: low · CVSS 3.1 · Published 2026-03-06

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.

Technologies: [changedetection.io (PyPI)](https://junglewise.ai/threats/technologies/changedetection-io). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-29038 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-29038 being exploited in the wild.

**How severe is CVE-2026-29038?** Low severity, with a CVSS score of 3.1, published 6 March 2026.

**Which products and versions are affected?** changedetection.io (PyPI) ECOSYSTEM:introduced=0,fixed=0.54.4.

**Is there a fix for CVE-2026-29038?** Yes. changedetection.io (PyPI): upgrade to 0.54.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-29038?** Check whether you run changedetection.io (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- changedetection.io (PyPI): upgrade to 0.54.4 or later

  ```sh
  pip install "changedetection.io>=0.54.4"
  ```


## Affected products

- changedetection.io (PyPI) ECOSYSTEM:introduced=0,fixed=0.54.4

## Identifiers

- CVE-2026-29038
- GHSA-8whx-v8qq-pq64
- PYSEC-2026-2127

## Related threats

- [dgtlmoon changedetection.io path traversal in static content route](https://junglewise.ai/threats/cve-2026-25527-dgtlmoon-changedetection-io-path-traversal-in-static-content)
- [PYSEC-2026-1241 - ChangeDetection.io XSS in watch overview](https://junglewise.ai/threats/cve-2025-52558-changedetection-io-xss-in-watch-overview)
- [PYSEC-2026-1242 - changedetection.io Vulnerable to Improper Input Validation Leading to LFR/Path Traversal](https://junglewise.ai/threats/cve-2024-56509-changedetection-io-vulnerable-to-improper-input-validation)
- [PYSEC-2026-1239 - changedetection.io path traversal using file URI scheme without supplying hostname](https://junglewise.ai/threats/cve-2024-51998-changedetection-io-path-traversal-using-file-uri-scheme-without)
- [PYSEC-2026-1240 - changedetection.io Path Traversal](https://junglewise.ai/threats/cve-2024-51483-changedetection-io-path-traversal)