CVE-2023-34020Network attack vector

User redirection via unvalidated REST parameter

Published Mar 27, 2024 · Updated Apr 28, 2026

Open redirect in Uncanny Owl Uncanny Toolkit for LearnDash 3.6.4.3 and earlier allows remote attackers to redirect users via a crafted URL. The unauthenticated /review-banner-visibility/ REST API endpoint accepts the redirect_url parameter without sufficient destination validation. A victim must follow an attacker-supplied link, after which the endpoint sends the browser to an untrusted site; no direct server compromise is reported.

CVSS severity4.7
Medium
EPSS probability0.96%
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 Uncanny Owl Uncanny Toolkit for LearnDash 3.6.4.3 and earlier allows remote attackers to redirect users via a crafted URL. The unauthenticated /review-banner-visibility/ REST API endpoint accepts the redirect_url parameter without sufficient destination validation. A victim must follow an attacker-supplied link, after which the endpoint sends the browser to an untrusted site; no direct server compromise is reported.

The record

CVE
CVE-2023-34020
Published
Mar 27, 2024
Updated
Apr 28, 2026
Vendor
Uncanny Owl
Product
Uncanny Toolkit for LearnDash
Classifications
CWE-601, CAPEC-178, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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=n/a <=3.6.4.3 changes=[{"at":"3.6.4.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Uncanny Owl · Uncanny Toolkit for LearnDashversion=n/a <=3.6.4.3 changes=[{"at":"3.6.4.4","status":"unaffected"}]

Published CVSS scores

4.7PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1566.002Spearphishing 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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