CVE-2021-3950Public exploitNetwork attack vector

Stored XSS via unvalidated ticket attachments

Published Nov 19, 2021 · Updated Aug 3, 2024

Stored XSS in django-helpdesk before 0.3.1 allows remote attackers to execute script in a ticket viewer's browser via a crafted attachment. The process_attachments function saves an Attachment without calling full_clean(), allowing HTML or SVG payloads to bypass model validation. A victim must open the uploaded attachment; successful exploitation runs same-origin script in that viewer's session.

CVSS severity5.4
Medium
EPSS probability0.80%
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 django-helpdesk before 0.3.1 allows remote attackers to execute script in a ticket viewer's browser via a crafted attachment. The process_attachments function saves an Attachment without calling full_clean(), allowing HTML or SVG payloads to bypass model validation. A victim must open the uploaded attachment; successful exploitation runs same-origin script in that viewer's session.

The record

CVE
CVE-2021-3950
Published
Nov 19, 2021
Updated
Aug 3, 2024
Vendor
django-helpdesk
Product
django-helpdesk
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 19, 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 <0.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

django-helpdesk · django-helpdeskversion=unspecified <0.3.1

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
8.8huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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