CVE-2021-32853Public exploitNetwork attack vector

Client-side code execution via unescaped topic identifier

Published Feb 20, 2023 · Updated Mar 10, 2025

Reflected XSS in npm erxes 0.22.3 and earlier allows remote attackers to execute client-side code through a crafted link. The knowledgebase route passes topicId to widget.ejs, which inserts it unescaped inside an inline JavaScript string and permits script-context breakout. Exploitation requires a victim to follow the link or be redirected, after which the injected script runs in the victim's browser context.

CVSS severity6.1
Medium
EPSS probability3.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in npm erxes 0.22.3 and earlier allows remote attackers to execute client-side code through a crafted link. The knowledgebase route passes topicId to widget.ejs, which inserts it unescaped inside an inline JavaScript string and permits script-context breakout. Exploitation requires a victim to follow the link or be redirected, after which the injected script runs in the victim's browser context.

The record

CVE
CVE-2021-32853
Published
Feb 20, 2023
Updated
Mar 10, 2025
Vendor
npm
Product
erxes
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2025Record 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=0.22.3 <=0.22.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

npm · erxesversion=0.22.3 <=0.22.3

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1204.001Malicious Link

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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