CVE-2021-44076Public exploitNetwork attack vector

Stored XSS via unencoded username rendering

Published Sep 15, 2022 · Updated Aug 4, 2024

Stored XSS in CrushFTP 9 allows remote authenticated users with administrative access to execute scripts in another administrator's browser. The UserManager interface stores a crafted username and renders it without output encoding inside an anchor attribute and a deletion dialog. Exploitation requires administration-panel access and a second administrator to view the Most Visited list or deletion prompt, exposing browser-accessible data and actions.

CVSS severity4.8
Medium
EPSS probability0.67%
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 CrushFTP 9 allows remote authenticated users with administrative access to execute scripts in another administrator's browser. The UserManager interface stores a crafted username and renders it without output encoding inside an anchor attribute and a deletion dialog. Exploitation requires administration-panel access and a second administrator to view the Most Visited list or deletion prompt, exposing browser-accessible data and actions.

The record

CVE
CVE-2021-44076
Published
Sep 15, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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