Vulnerability Details : CVE-2021-23393
This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False.
Vulnerability category: Open redirect
Products affected by CVE-2021-23393
- cpe:2.3:a:flask_unchained_project:flask_unchained:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-23393
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 22 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23393
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:N |
8.6
|
4.9
|
NIST | |
|
5.4
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
2.8
|
2.5
|
NIST | |
|
5.4
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
2.8
|
2.5
|
Snyk |
CWE ids for CVE-2021-23393
-
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23393
-
https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189
Open Redirect in flask-unchained | SnykPatch;Third Party Advisory
-
https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40
add tests for validate_redirect_url · briancappello/flask-unchained@71e36b2 · GitHubPatch;Third Party Advisory
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