CVE-2021-24466Public exploitNetwork attack vector

Administrator browser script execution via forged requests

Published Aug 16, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in Chad Butler Verse-O-Matic 4.1.1 and earlier allows remote attackers to execute script in an administrator's browser. The settings and verse handlers accept forged administrator requests without CSRF checks and store unsanitized parameter values for later rendering. Exploitation requires a logged-in administrator to submit an attacker-controlled request, enabling verse deletion, settings changes, or persistent browser-script execution.

CVSS severity6.1
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Chad Butler Verse-O-Matic 4.1.1 and earlier allows remote attackers to execute script in an administrator's browser. The settings and verse handlers accept forged administrator requests without CSRF checks and store unsanitized parameter values for later rendering. Exploitation requires a logged-in administrator to submit an attacker-controlled request, enabling verse deletion, settings changes, or persistent browser-script execution.

The record

CVE
CVE-2021-24466
Published
Aug 16, 2021
Updated
Aug 3, 2024
Vendor
Chad Butler
Product
Verse-O-Matic
Classifications
CWE-352, CWE-79, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 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=4.1.1 <=4.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chad Butler · Verse-O-Maticversion=4.1.1 <=4.1.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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 exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User Execution

Public exploit references

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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