CVE-2021-24705Public exploitNetwork attack vector

Stored script execution via CSRF form editing

Published Dec 13, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in Basix NEX-Forms before 8.4.3 allows remote attackers to inject script through an administrator's browser. The nf_update_record AJAX action accepts form_fields and settings without a CSRF nonce check, stores them, and later emits values into dashboard attributes without escaping. Exploitation requires a logged-in administrator to submit the forged request and view the affected dashboard, where the script runs in the site's origin with that session.

CVSS severity4.8
Medium
EPSS probability0.30%
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 Basix NEX-Forms before 8.4.3 allows remote attackers to inject script through an administrator's browser. The nf_update_record AJAX action accepts form_fields and settings without a CSRF nonce check, stores them, and later emits values into dashboard attributes without escaping. Exploitation requires a logged-in administrator to submit the forged request and view the affected dashboard, where the script runs in the site's origin with that session.

The record

CVE
CVE-2021-24705
Published
Dec 13, 2021
Updated
Aug 3, 2024
Vendor
Basix
Product
NEX-Forms
Classifications
CWE-352, CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 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=0 <8.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Basix · NEX-Formsversion=0 <8.4.3

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS: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 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-352Cross-Site Request Forgery (CSRF)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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