Django REST framework

Lookup for vulnerabilities affecting packages.

Vulnerability_id VCID-3wbt-wcwe-r3b3

Summary 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.

Aliases

alias	CVE-2021-23393

alias	GHSA-pjc4-3w99-j7v4

alias	PYSEC-2021-96

alias	SNYK-PYTHON-FLASKUNCHAINED-1293189

Fixed_packages

url	pkg:pypi/flask-unchained@0.9.0
purl	pkg:pypi/flask-unchained@0.9.0
is_vulnerable	`false`
affected_by_vulnerabilities
resource_url	http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.9.0

Affected_packages

url pkg:pypi/flask-unchained@0.1.2

purl pkg:pypi/flask-unchained@0.1.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.1.2

url pkg:pypi/flask-unchained@0.1.3

purl pkg:pypi/flask-unchained@0.1.3

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.1.3

url pkg:pypi/flask-unchained@0.1.4

purl pkg:pypi/flask-unchained@0.1.4

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.1.4

url pkg:pypi/flask-unchained@0.1.5

purl pkg:pypi/flask-unchained@0.1.5

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.1.5

url pkg:pypi/flask-unchained@0.1.6

purl pkg:pypi/flask-unchained@0.1.6

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.1.6

url pkg:pypi/flask-unchained@0.2.0

purl pkg:pypi/flask-unchained@0.2.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.2.0

url pkg:pypi/flask-unchained@0.2.1

purl pkg:pypi/flask-unchained@0.2.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.2.1

url pkg:pypi/flask-unchained@0.2.2

purl pkg:pypi/flask-unchained@0.2.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.2.2

url pkg:pypi/flask-unchained@0.3.0

purl pkg:pypi/flask-unchained@0.3.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.3.0

url pkg:pypi/flask-unchained@0.3.1

purl pkg:pypi/flask-unchained@0.3.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.3.1

url pkg:pypi/flask-unchained@0.3.2

purl pkg:pypi/flask-unchained@0.3.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.3.2

url pkg:pypi/flask-unchained@0.4.0

purl pkg:pypi/flask-unchained@0.4.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.4.0

url pkg:pypi/flask-unchained@0.4.1

purl pkg:pypi/flask-unchained@0.4.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.4.1

url pkg:pypi/flask-unchained@0.4.2

purl pkg:pypi/flask-unchained@0.4.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.4.2

url pkg:pypi/flask-unchained@0.5.0

purl pkg:pypi/flask-unchained@0.5.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.5.0

url pkg:pypi/flask-unchained@0.5.1

purl pkg:pypi/flask-unchained@0.5.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.5.1

url pkg:pypi/flask-unchained@0.6.0

purl pkg:pypi/flask-unchained@0.6.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.0

url pkg:pypi/flask-unchained@0.6.1

purl pkg:pypi/flask-unchained@0.6.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.1

url pkg:pypi/flask-unchained@0.6.2

purl pkg:pypi/flask-unchained@0.6.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.2

url pkg:pypi/flask-unchained@0.6.3

purl pkg:pypi/flask-unchained@0.6.3

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.3

url pkg:pypi/flask-unchained@0.6.4

purl pkg:pypi/flask-unchained@0.6.4

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.4

url pkg:pypi/flask-unchained@0.6.5

purl pkg:pypi/flask-unchained@0.6.5

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.5

url pkg:pypi/flask-unchained@0.6.6

purl pkg:pypi/flask-unchained@0.6.6

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.6.6

url pkg:pypi/flask-unchained@0.7.0

purl pkg:pypi/flask-unchained@0.7.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.0

url pkg:pypi/flask-unchained@0.7.1

purl pkg:pypi/flask-unchained@0.7.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.1

url pkg:pypi/flask-unchained@0.7.2

purl pkg:pypi/flask-unchained@0.7.2

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.2

url pkg:pypi/flask-unchained@0.7.3

purl pkg:pypi/flask-unchained@0.7.3

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.3

url pkg:pypi/flask-unchained@0.7.4

purl pkg:pypi/flask-unchained@0.7.4

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.4

url pkg:pypi/flask-unchained@0.7.5

purl pkg:pypi/flask-unchained@0.7.5

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.5

url pkg:pypi/flask-unchained@0.7.6

purl pkg:pypi/flask-unchained@0.7.6

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.6

url pkg:pypi/flask-unchained@0.7.7

purl pkg:pypi/flask-unchained@0.7.7

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.7

url pkg:pypi/flask-unchained@0.7.8

purl pkg:pypi/flask-unchained@0.7.8

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.8

url pkg:pypi/flask-unchained@0.7.9

purl pkg:pypi/flask-unchained@0.7.9

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.7.9

url pkg:pypi/flask-unchained@0.8.0

purl pkg:pypi/flask-unchained@0.8.0

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.8.0

url pkg:pypi/flask-unchained@0.8.1

purl pkg:pypi/flask-unchained@0.8.1

is_vulnerable true

affected_by_vulnerabilities

vulnerability	VCID-3wbt-wcwe-r3b3

resource_url http://public2.vulnerablecode.io/packages/pkg:pypi/flask-unchained@0.8.1

References

reference_url

https://api.first.org/data/v1/epss?cve=CVE-2021-23393

reference_id

reference_type

scores

value	0.002
scoring_system	epss
scoring_elements	0.42001
published_at	2026-06-11T12:55:00Z

value	0.002
scoring_system	epss
scoring_elements	0.42165
published_at	2026-06-12T12:55:00Z

url

https://api.first.org/data/v1/epss?cve=CVE-2021-23393

reference_url

https://github.com/advisories/GHSA-pjc4-3w99-j7v4

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	MODERATE
scoring_system	cvssv3.1_qr
scoring_elements

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://github.com/advisories/GHSA-pjc4-3w99-j7v4

reference_url

https://github.com/briancappello/flask-unchained/commit/2bfeedf1bc31df851cab8c66df0c432b10406aad

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://github.com/briancappello/flask-unchained/commit/2bfeedf1bc31df851cab8c66df0c432b10406aad

reference_url

https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40

reference_url

https://github.com/pypa/advisory-database/tree/main/vulns/flask-unchained/PYSEC-2021-96.yaml

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://github.com/pypa/advisory-database/tree/main/vulns/flask-unchained/PYSEC-2021-96.yaml

reference_url

https://nvd.nist.gov/vuln/detail/CVE-2021-23393

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://nvd.nist.gov/vuln/detail/CVE-2021-23393

reference_url

https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189

reference_id

reference_type

scores

value	5.4
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

value	5.3
scoring_system	cvssv4
scoring_elements	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

value	MODERATE
scoring_system	generic_textual
scoring_elements

url

https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189

Weaknesses

cwe_id	601
name	URL Redirection to Untrusted Site ('Open Redirect')
description	A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks.

cwe_id	937
name	OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
description	Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013.

cwe_id	1035
name	OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
description	Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017.

Exploits

Severity_range_score 4.0 - 6.9

Exploitability 0.5

Weighted_severity 6.2

Risk_score 3.1

Resource_url http://public2.vulnerablecode.io/vulnerabilities/VCID-3wbt-wcwe-r3b3

Vulnerability Instance