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CVE-2026-35490

Webtechnologies Changedetection broken access control

9.8 CRITICALPublic exploitEPSS 0.64%
  1. Published7 Apr 2026

Description

changedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes. This vulnerability is fixed in 0.54.8.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Webtechnologies Changedetection< 0.54.8

Remediation

Fixed in
Webtechnologies Changedetection≥ 0.54.8

References

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Frequently asked

Is CVE-2026-35490 being actively exploited?

CVE-2026-35490 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-35490?

CVE-2026-35490 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-35490?

Affected products include Webtechnologies Changedetection.

How do I fix CVE-2026-35490?

Upgrade affected software to a fixed version, for example Webtechnologies Changedetection 0.54.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-35490 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.