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Vulnerability details: VCID-q13z-976n-gke3
Vulnerability ID VCID-q13z-976n-gke3
Aliases CVE-2020-28724
GHSA-3p3h-qghp-hvh2
PYSEC-2020-157
Summary Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 5.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28724.json
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
epss 0.00923 https://api.first.org/data/v1/epss?cve=CVE-2020-28724
cvssv3.1 6.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-3p3h-qghp-hvh2
cvssv3.1 6.1 https://github.com/pallets/flask/issues/1639
cvssv4 5.3 https://github.com/pallets/flask/issues/1639
generic_textual MODERATE https://github.com/pallets/flask/issues/1639
cvssv3.1 6.1 https://github.com/pallets/werkzeug
cvssv4 5.3 https://github.com/pallets/werkzeug
generic_textual MODERATE https://github.com/pallets/werkzeug
cvssv3.1 6.1 https://github.com/pallets/werkzeug/issues/822
cvssv4 5.3 https://github.com/pallets/werkzeug/issues/822
generic_textual MODERATE https://github.com/pallets/werkzeug/issues/822
cvssv3.1 6.1 https://github.com/pallets/werkzeug/pull/890/files
cvssv4 5.3 https://github.com/pallets/werkzeug/pull/890/files
generic_textual MODERATE https://github.com/pallets/werkzeug/pull/890/files
cvssv3.1 6.1 https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
cvssv4 5.3 https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
generic_textual MODERATE https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2020-28724
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2020-28724
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-28724
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28724.json
https://api.first.org/data/v1/epss?cve=CVE-2020-28724
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28724
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-3p3h-qghp-hvh2
https://github.com/pallets/flask/issues/1639
https://github.com/pallets/werkzeug
https://github.com/pallets/werkzeug/issues/822
https://github.com/pallets/werkzeug/pull/890/files
https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
https://nvd.nist.gov/vuln/detail/CVE-2020-28724
1899267 https://bugzilla.redhat.com/show_bug.cgi?id=1899267
USN-4655-1 https://usn.ubuntu.com/4655-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28724.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pallets/flask/issues/1639
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pallets/flask/issues/1639
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

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none

passive

active

high

low

none

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none

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low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pallets/werkzeug
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pallets/werkzeug
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pallets/werkzeug/issues/822
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pallets/werkzeug/issues/822
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pallets/werkzeug/pull/890/files
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pallets/werkzeug/pull/890/files
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28724
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28724
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.75926
EPSS Score 0.00923
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:43:05.822233+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/werkzeug/PYSEC-2020-157.yaml 38.0.0