CVE-2023-0147Network attack vector

Stored XSS via unescaped shortcode attributes

Published Feb 6, 2023 · Updated Mar 25, 2025

Stored XSS in foomagoo Flexible Captcha 4.1 and earlier allows remote authenticated users to inject scripts through shortcode attributes. The plugin returns contributor-supplied shortcode attributes in page or post output without validating or escaping them. Contributor access is required to store the payload, which executes in a visitor's browser when the affected content is viewed.

CVSS severity5.4
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in foomagoo Flexible Captcha 4.1 and earlier allows remote authenticated users to inject scripts through shortcode attributes. The plugin returns contributor-supplied shortcode attributes in page or post output without validating or escaping them. Contributor access is required to store the payload, which executes in a visitor's browser when the affected content is viewed.

The record

CVE
CVE-2023-0147
Published
Feb 6, 2023
Updated
Mar 25, 2025
Vendor
foomagoo
Product
Flexible Captcha
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2025Record 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 <=4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

foomagoo · Flexible Captchaversion=0 <=4.1

Published CVSS scores

5.4CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-Site Scripting (XSS)
T1059.007JavaScript/JScript

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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