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Vulnerability details: VCID-sjj8-nvvx-k3fk
Vulnerability ID VCID-sjj8-nvvx-k3fk
Aliases CVE-2020-7965
GHSA-fjq3-5pxw-4wj4
PYSEC-2020-156
Summary flaskparser.py in Webargs 5.x through 5.5.2 doesn't check that the Content-Type header is application/json when receiving JSON input. If the request body is valid JSON, it will accept it even if the content type is application/x-www-form-urlencoded. This allows for JSON POST requests to be made across domains, leading to CSRF.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-352 Cross-Site Request Forgery (CSRF)
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
epss 0.00167 https://api.first.org/data/v1/epss?cve=CVE-2020-7965
epss 0.00167 https://api.first.org/data/v1/epss?cve=CVE-2020-7965
epss 0.00167 https://api.first.org/data/v1/epss?cve=CVE-2020-7965
epss 0.00167 https://api.first.org/data/v1/epss?cve=CVE-2020-7965
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fjq3-5pxw-4wj4
cvssv3.1 8.8 https://github.com/marshmallow-code/webargs
cvssv4 8.7 https://github.com/marshmallow-code/webargs
generic_textual HIGH https://github.com/marshmallow-code/webargs
cvssv3.1 8.8 https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
cvssv4 8.7 https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
generic_textual HIGH https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
cvssv3.1 8.8 https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
cvssv4 8.7 https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
generic_textual HIGH https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-7965
cvssv4 8.7 https://nvd.nist.gov/vuln/detail/CVE-2020-7965
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-7965
cvssv3.1 8.8 https://webargs.readthedocs.io/en/latest/changelog.html
cvssv4 8.7 https://webargs.readthedocs.io/en/latest/changelog.html
generic_textual HIGH https://webargs.readthedocs.io/en/latest/changelog.html
cvssv3.1 8.8 https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
cvssv4 8.7 https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
generic_textual HIGH https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
cvssv3.1 8.8 https://webargs.readthedocs.io/en/latest/changelog.html#id11
cvssv4 8.7 https://webargs.readthedocs.io/en/latest/changelog.html#id11
generic_textual HIGH https://webargs.readthedocs.io/en/latest/changelog.html#id11
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-7965
https://github.com/advisories/GHSA-fjq3-5pxw-4wj4
https://github.com/marshmallow-code/webargs
https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
https://nvd.nist.gov/vuln/detail/CVE-2020-7965
https://webargs.readthedocs.io/en/latest/changelog.html
https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
https://webargs.readthedocs.io/en/latest/changelog.html#id11
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/marshmallow-code/webargs
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

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none

required

unchanged

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high

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none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/marshmallow-code/webargs
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

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passive

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
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

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none

required

unchanged

changed

high

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none

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none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
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

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passive

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.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

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none

required

unchanged

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high

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.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

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none

present

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passive

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-7965
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

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high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-7965
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

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passive

active

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://webargs.readthedocs.io/en/latest/changelog.html
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

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none

high

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none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://webargs.readthedocs.io/en/latest/changelog.html
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

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passive

active

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
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:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
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

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none

high

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none

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://webargs.readthedocs.io/en/latest/changelog.html#id11
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:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://webargs.readthedocs.io/en/latest/changelog.html#id11
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

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none

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none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.37621
EPSS Score 0.00167
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T20:45:05.850475+00:00 PyPI Importer Import https://osv-vulnerabilities.storage.googleapis.com/PyPI/all.zip 38.6.0