Is CVE-2026-35490 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-35490 being exploited in the wild.

How severe is CVE-2026-35490?

Critical severity, with a CVSS score of 9.8, published 7 April 2026.

Which products and versions are affected?

changedetection.io (PyPI) <= 0.54.7, ECOSYSTEM:introduced=0,fixed=0.54.8.

Is there a fix for CVE-2026-35490?

Yes. changedetection.io (PyPI): upgrade to 0.54.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-35490 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-35490?

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.

CVE-2026-35490: dgtlmoon changedetection.io authentication bypass via decorator ordering

Q: Is there a fix for CVE-2026-35490?

Yes. changedetection.io (PyPI): upgrade to 0.54.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-35490 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-35490?

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.

CVE-2026-35490 · Severity: critical · CVSS 9.8 · Published 2026-04-07

changedetection.io, a tool used to monitor website changes, contains a flaw that allows anyone to bypass login requirements on several critical pages. An attacker can use this to download full system backups containing sensitive data like passwords and API tokens, or even delete existing backups. This could lead to a total compromise of the monitoring service and any connected accounts.

Technologies: changedetection.io (PyPI), Webtechnologies Changedetection. Vendors: PyPI, Webtechnologies.

Quick answers

Is CVE-2026-35490 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-35490 being exploited in the wild.
How severe is CVE-2026-35490?: Critical severity, with a CVSS score of 9.8, published 7 April 2026.
Which products and versions are affected?: changedetection.io (PyPI) <= 0.54.7, ECOSYSTEM:introduced=0,fixed=0.54.8.
Is there a fix for CVE-2026-35490?: Yes. changedetection.io (PyPI): upgrade to 0.54.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-35490 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-35490?: 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 0.54.8 or later
```
pip install "changedetection.io>=0.54.8"
```

Technical details

An authentication bypass exists in changedetection.io due to the incorrect ordering of Flask decorators on 13 specific routes. In the affected code, the `@login_optionally_required` decorator was placed outside the `@blueprint.route()` decorator; because Flask's `@route` registers the function it immediately wraps, it registered the raw, unprotected view function instead of the decorated one. A remote, unauthenticated attacker can exploit this to access endpoints such as `/backups/`, `/backups/download/<filename>`, and `/backups/remove-backups`. This allows for full data exfiltration (including password hashes and notification tokens), SSRF via proxy checks, and potential configuration injection. The issue is fixed in version 0.54.8 by swapping the decorator order.

Affected products

dgtlmoon changedetection.io <= 0.54.7

Identifiers

CVE-2026-35490
GHSA-jmrh-xmgh-x9j4
PYSEC-2026-28

Timeline

2026-04-04: disclosed: Initial disclosure by dgtlmoon
2026-04-06: advisory: GitHub Advisory published
2026-04-07: other: NVD publication date

References

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