How severe is CVE-2026-35490?

CVE-2026-35490 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35490?

CVE-2026-35490 affects Webtechnologies Changedetection. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35490?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-35490 have an EU (EUVD) identifier?

Yes. CVE-2026-35490 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19675.

When was CVE-2026-35490 published?

CVE-2026-35490 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-35490

CVE-2026-35490 is a critical-severity vulnerability in Webtechnologies Changedetection with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19675
Weakness: CWE-863
Affected product: Webtechnologies Changedetection
Published: 2026-04-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35490?: 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.
How severe is CVE-2026-35490?: CVE-2026-35490 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35490?: CVE-2026-35490 affects Webtechnologies Changedetection. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35490?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-35490 have an EU (EUVD) identifier?: Yes. CVE-2026-35490 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19675.
When was CVE-2026-35490 published?: CVE-2026-35490 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4

Affected products (1)

cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:*

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