Medium severity · published May 20, 2021
CVE-2021-3313
Plone CMS until version 5.2.4 has a stored Cross-Site Scripting (XSS) vulnerability in the user fullname property and the file upload functionality
5.4
CVSS
1%
EPSS
No
On KEV
Description
Plone CMS until version 5.2.4 has a stored Cross-Site Scripting (XSS) vulnerability in the user fullname property and the file upload functionality. The user's input data is not properly encoded when being echoed back to the user. This data can be interpreted as executable code by the browser and allows an attacker to execute JavaScript in the context of the victim's browser if the victim opens a vulnerable page containing an XSS payload.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PL
Plone · Plone
before 5.2.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3313
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3313
Mailing List
http://www.openwall.com/lists/oss-security/2021/05/22/1
Release Notes
https://plone.org/download/releases/5.2.3
Vendor Advisory
https://plone.org/security/hotfix/20210518
Exploit
https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txt
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