CVE-2024-34009Network attack vector

Login ReCAPTCHA bypass via missing enablement check

Published May 31, 2024 · Updated Aug 2, 2024

Improper input validation in Moodle LMS 4.3 through 4.3.3 allows remote attackers to bypass ReCAPTCHA on the login page. The login authentication path fails to confirm that ReCAPTCHA is enabled before deciding whether to enforce its response validation. The site must use ReCAPTCHA on login; other ReCAPTCHA-protected pages are unaffected, and the documented impact is limited to bypassing that login control.

CVSS severity8.7
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Moodle LMS 4.3 through 4.3.3 allows remote attackers to bypass ReCAPTCHA on the login page. The login authentication path fails to confirm that ReCAPTCHA is enabled before deciding whether to enforce its response validation. The site must use ReCAPTCHA on login; other ReCAPTCHA-protected pages are unaffected, and the documented impact is limited to bypassing that login control.

The record

CVE
CVE-2024-34009
Published
May 31, 2024
Updated
Aug 2, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=4.3 <=4.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=4.3 <=4.3.3

Published CVSS scores

8.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
7.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

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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