CVE-2021-33853Network attack vector

Browser script execution via stored CRM content

Published Mar 16, 2022 · Updated Aug 4, 2024

Stored cross-site scripting in X2Engine X2CRM 8 allows attackers to execute JavaScript in a user's browser through stored CRM content. The published record does not identify the input field, request handler, or output path that stores unneutralized content, but states that the payload runs when the user opens any CRM page. A victim must access the affected CRM, after which the script runs in the trusted site context with that browser session's access.

CVSS severityUnavailable
Unscored
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in X2Engine X2CRM 8 allows attackers to execute JavaScript in a user's browser through stored CRM content. The published record does not identify the input field, request handler, or output path that stores unneutralized content, but states that the payload runs when the user opens any CRM page. A victim must access the affected CRM, after which the script runs in the trusted site context with that browser session's access.

The record

CVE
CVE-2021-33853
Published
Mar 16, 2022
Updated
Aug 4, 2024
Vendor
X2Engine
Product
X2CRM
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

X2Engine · X2CRMversion=8

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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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