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CVE-2021-3313

MEDIUM
5.4
CVSS Score
Published: May 20, 2021 at 03:34 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorPlone

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Severity
MEDIUM5.4
Exploit prediction
EPSS 1.0%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Plone· Plone
95%
v < 5.2.4
Affected range stops below 5.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/05/22/1
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://plone.org/download/releases/5.2.3
x_refsource_MISCVendor Advisory
Source: [email protected]
https://plone.org/security/hotfix/20210518
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txt

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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