CVE-2021-4084Public exploitNetwork attack vector

Stored script execution via unencoded class settings

Published Dec 10, 2021 · Updated Aug 3, 2024

Stored XSS in Pimcore before 10.2.6 allows remote attackers to execute script in an administrator's browser via class settings. The AdminBundle DataObject class editor stored text-field values and rendered class names, descriptions, traits, URLs, and related settings without HTML encoding. A victim must open affected content; the script runs in that browser session and can read or alter data available to it.

CVSS severity6.1
Medium
EPSS probability1.56%
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 10.2.6 allows remote attackers to execute script in an administrator's browser via class settings. The AdminBundle DataObject class editor stored text-field values and rendered class names, descriptions, traits, URLs, and related settings without HTML encoding. A victim must open affected content; the script runs in that browser session and can read or alter data available to it.

The record

CVE
CVE-2021-4084
Published
Dec 10, 2021
Updated
Aug 3, 2024
Vendor
Pimcore
Product
Pimcore
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 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 <10.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pimcore · Pimcoreversion=unspecified <10.2.6

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.4huntr.devCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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