# CVE-2026-35000: ChangeDetection.io arbitrary file read in SafeXPath3Parser

Source: https://junglewise.ai/threats/cve-2026-35000-changedetection-io-arbitrary-file-read-in-safexpath3parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-01. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-35000 · Severity: medium · CVSS 6.5 · Published 2026-04-01

ChangeDetection.io, a tool used to monitor websites for content changes, contains a security flaw that allows users to read sensitive files from the server's local storage. By using specific commands in the website's filtering settings, an attacker could access private configuration files or system data. This could lead to the exposure of credentials or other confidential information stored on the host machine.

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

## Quick answers

**Is CVE-2026-35000 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35000 being exploited in the wild.

**How severe is CVE-2026-35000?** Medium severity, with a CVSS score of 6.5, published 1 April 2026.

**Which products and versions are affected?** changedetection.io (PyPI) ECOSYSTEM:introduced=0,fixed=0.54.7.

**Is there a fix for CVE-2026-35000?** Yes. changedetection.io (PyPI): upgrade to 0.54.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-35000 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-35000?** Check whether you run changedetection.io (PyPI) or Webtechnologies Changedetection 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 0.54.7 or later

  ```sh
  pip install "changedetection.io>=0.54.7"
  ```


## Technical details

A protection bypass vulnerability exists in the SafeXPath3Parser implementation of ChangeDetection.io. The application uses a blocklist to prevent the execution of dangerous XPath functions; however, this list was incomplete, failing to include several XPath 3.0/3.1 file-access primitives. An authenticated attacker with network access can provide crafted XPath selectors using functions such as json-doc(), collection(), or uri-collection() to bypass security restrictions and read arbitrary files from the local filesystem. The issue is addressed in version 0.54.7 by expanding the blocklist in html_tools.py to include these functions.

## Affected products

- dgtlmoon ChangeDetection.io < 0.54.7

## Identifiers

- CVE-2026-35000
- PYSEC-2026-2131

## Timeline

- 2026-03-26: patched: Version 0.54.7 released with fix
- 2026-04-01: disclosed: Initial vulnerability disclosure

## References

- [https://github.com/dgtlmoon/changedetection.io/commit/dadc804567a51f803cd6715f7885c11a247915f6](https://github.com/dgtlmoon/changedetection.io/commit/dadc804567a51f803cd6715f7885c11a247915f6)
- [https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.7](https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.7)
- [https://www.vulncheck.com/advisories/changedetection-io-safexpath3parser-bypass-arbitrary-file-read](https://www.vulncheck.com/advisories/changedetection-io-safexpath3parser-bypass-arbitrary-file-read)

## 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)