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Vulnerability details: VCID-dnu9-u6zt-c7ch
Vulnerability ID VCID-dnu9-u6zt-c7ch
Aliases CVE-2021-35959
GHSA-qfhw-fv3g-v836
PYSEC-2021-110
Summary In Plone 5.0 through 5.2.4, Editors are vulnerable to XSS in the folder contents view, if a Contributor has created a folder with a SCRIPT tag in the description field.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-35959
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-qfhw-fv3g-v836
cvssv3.1 6.1 https://github.com/plone/Plone
cvssv4 5.3 https://github.com/plone/Plone
generic_textual MODERATE https://github.com/plone/Plone
cvssv3.1 6.1 https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-110.yaml
cvssv4 5.3 https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-110.yaml
generic_textual MODERATE https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-110.yaml
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-35959
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2021-35959
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-35959
cvssv3.1 6.1 https://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
cvssv4 5.3 https://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
generic_textual MODERATE https://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
cvssv3.1 6.1 http://www.openwall.com/lists/oss-security/2021/06/30/2
cvssv4 5.3 http://www.openwall.com/lists/oss-security/2021/06/30/2
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2021/06/30/2
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-35959
https://github.com/plone/Plone
https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-110.yaml
https://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
http://www.openwall.com/lists/oss-security/2021/06/30/2
CVE-2021-35959 https://nvd.nist.gov/vuln/detail/CVE-2021-35959
GHSA-qfhw-fv3g-v836 https://github.com/advisories/GHSA-qfhw-fv3g-v836
No exploits are available.
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/plone/Plone
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/plone/Plone
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/plone/PYSEC-2021-110.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/plone/PYSEC-2021-110.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-2021-35959
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-2021-35959
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://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
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://plone.org/security/hotfix/20210518/stored-xss-in-folder-contents
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 http://www.openwall.com/lists/oss-security/2021/06/30/2
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 http://www.openwall.com/lists/oss-security/2021/06/30/2
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 0.53803
EPSS Score 0.00302
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:27:09.235462+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/plone/PYSEC-2021-110.yaml 38.6.0