CVE-2026-35490: dgtlmoon changedetection.io Incorrect Authorization
Vulnerability summary
CVE-2026-35490 is a critical (CVSS 9.8) Incorrect Authorization vulnerability in dgtlmoon changedetection.io. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 50.1% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 07-04-2026PublishedVulnerability first disclosed.
- 09-04-2026Last modifiedVulnerability information updated.
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 metrics
3 scores · 3 sources · 1 version- OSV · PypiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.64%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
+0.11 pp
From 0.54% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundChangedetection.Io
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Dgtlmoon1 product
- changedetection.io< 0.54.8
PyPI1 product
- changedetection-io< 0.54.8
Webtechnologies1 product
- changedetection< 0.54.8
3 vendors · 3 products
References
6 links- github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4X Refsource CONFIRMWEBEVIDENCEExploitMitigationVendor Advisory
