CVE-2026-35490 json
changedetection.io has an Authentication Bypass via Decorator Ordering
published 2026-04-06 7 mo ago modified 2026-10-26 13 d ago also GHSA-jmrh-xmgh-x9j4 , PYSEC-2026-28 , EUVD-2026-19675
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi changedetection-io 0.54.8
- webtechnologies changedetection 0.54.8
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | changedetection-io | <0.54.8 |
0.54.8 |
Affected products
- dgtlmoon changedetection.io
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/dgtlmoon/changedetection.io/commit/31a760c2147e3e73a403baf6d7de34dc50429c85
web
-
github.com
/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4
exploit, web, mitigation, vendor-advisory, evidence
-
nvd.nist.gov
/vuln/detail/CVE-2026-35490
advisory
-
github.com
/dgtlmoon/changedetection.io
package
-
github.com
/dgtlmoon/changedetection.io/releases/tag/0.54.8
web
-
github.com
/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-28.yaml
web
Sources
- CVE List CVE-2026-35490
- GitHub Advisory GHSA-jmrh-xmgh-x9j4
- NVD CVE-2026-35490
- OSV PYSEC-2026-28
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.