CVE-2021-4139Public exploitNetwork attack vector

Stored script execution via unencoded Classification Store fields

Published Dec 21, 2021 · Updated Aug 3, 2024

Stored XSS in Pimcore before 10.2.7 allows remote authenticated users to execute script through crafted Classification Store fields. Classification Store names, descriptions, titles, and translated grid values are rendered without HTML encoding, allowing saved markup to reach Ext JS grids, tooltips, and titles. High-privileged access is required to save the fields, and execution occurs when an affected administrative view renders them.

CVSS severity6.6
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Pimcore before 10.2.7 allows remote authenticated users to execute script through crafted Classification Store fields. Classification Store names, descriptions, titles, and translated grid values are rendered without HTML encoding, allowing saved markup to reach Ext JS grids, tooltips, and titles. High-privileged access is required to save the fields, and execution occurs when an affected administrative view renders them.

The record

CVE
CVE-2021-4139
Published
Dec 21, 2021
Updated
Aug 3, 2024
Vendor
Pimcore
Product
Pimcore
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <10.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Pimcore · Pimcoreversion=unspecified <10.2.7

Published CVSS scores

9.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
6.6huntr.devCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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