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Vulnerability details: VCID-ccuu-86vs-s3gs
Vulnerability ID VCID-ccuu-86vs-s3gs
Aliases CVE-2021-29002
GHSA-38g6-x6jv-jwff
PYSEC-2021-889
Summary A stored cross-site scripting (XSS) vulnerability in Plone CMS 5.2.3 exists in site-controlpanel via the "form.widgets.site_title" parameter.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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 0.0031 https://api.first.org/data/v1/epss?cve=CVE-2021-29002
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-38g6-x6jv-jwff
generic_textual MODERATE https://github.com/plone/Plone
cvssv3.1 5.4 https://github.com/plone/Products.CMFPlone/issues/3255
generic_textual MODERATE https://github.com/plone/Products.CMFPlone/issues/3255
generic_textual MODERATE https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-889.yaml
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-29002
cvssv3.1 5.4 https://www.exploit-db.com/exploits/49668
generic_textual MODERATE https://www.exploit-db.com/exploits/49668
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-29002
https://github.com/plone/Plone
https://github.com/plone/Products.CMFPlone/issues/3255
https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-889.yaml
https://www.exploit-db.com/exploits/49668
CVE-2021-29002 https://nvd.nist.gov/vuln/detail/CVE-2021-29002
GHSA-38g6-x6jv-jwff https://github.com/advisories/GHSA-38g6-x6jv-jwff
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/plone/Products.CMFPlone/issues/3255
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:R/S:C/C:L/I:L/A:N Found at https://www.exploit-db.com/exploits/49668
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.544
EPSS Score 0.0031
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:22:26.832464+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/plone/PYSEC-2021-889.yaml 38.6.0