CVE-2021-24165Network attack vector

Administrator open redirect via unvalidated redirect parameter

Published Apr 5, 2021 · Updated Aug 3, 2024

Open redirect in Ninja Forms before 3.4.34 allows remote attackers to redirect WordPress administrators to arbitrary URLs through OAuth connection requests. The wp_ajax_nf_oauth_connect action uses a user-supplied redirect parameter without protection, sending the administrator's browser to the supplied destination. Exploitation requires the administrator to follow or load the crafted request, enabling phishing or token-interception setup rather than direct server compromise.

CVSS severity6.1
Medium
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Ninja Forms before 3.4.34 allows remote attackers to redirect WordPress administrators to arbitrary URLs through OAuth connection requests. The wp_ajax_nf_oauth_connect action uses a user-supplied redirect parameter without protection, sending the administrator's browser to the supplied destination. Exploitation requires the administrator to follow or load the crafted request, enabling phishing or token-interception setup rather than direct server compromise.

The record

CVE
CVE-2021-24165
Published
Apr 5, 2021
Updated
Aug 3, 2024
Vendor
Saturday Drive
Product
Ninja Forms
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 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=3.4.34 <3.4.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Saturday Drive · Ninja Formsversion=3.4.34 <3.4.34

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.0NISTAV:N/AC:M/Au:N/C:P/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Phishing: Malicious Link

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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