CVE-2023-41862Network attack vector

Unauthenticated sum CAPTCHA bypass

Published Dec 13, 2024 · Updated Apr 28, 2026

Weak authentication in Guido VS Contact Form 14.0 and earlier allows remote attackers to bypass the sum CAPTCHA on contact-form requests. Patchstack and the upstream plugin materials do not disclose the flawed validation operation or identify which request value defeats the sum check. No account or user interaction is required; the published record assigns limited confidentiality impact without identifying what information becomes exposed.

CVSS severity5.3
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak authentication in Guido VS Contact Form 14.0 and earlier allows remote attackers to bypass the sum CAPTCHA on contact-form requests. Patchstack and the upstream plugin materials do not disclose the flawed validation operation or identify which request value defeats the sum check. No account or user interaction is required; the published record assigns limited confidentiality impact without identifying what information becomes exposed.

The record

CVE
CVE-2023-41862
Published
Dec 13, 2024
Updated
Apr 28, 2026
Vendor
Guido
Product
VS Contact Form
Classifications
CWE-1390, CAPEC-114, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 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 <=14.0 changes=[{"at":"14.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Guido · VS Contact Formversion=n/a <=14.0 changes=[{"at":"14.1","status":"unaffected"}]

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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-1390Weak Authentication
CAPEC-114Authentication Abuse
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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