CVE-2021-29467

Arbitrary JavaScript execution via crafted fingerprint input

Published Apr 22, 2021 · Updated Aug 3, 2024

Cross-site scripting in Wrongthink before 2.4.1 allows local users to execute arbitrary JavaScript through crafted fingerprint input. The fingerprint check-in path accepts script markup as a fingerprint and renders it without neutralizing script-related HTML. The user must be able to check a fingerprint into the service; execution occurs in the site's origin and can expose accessible data or alter page actions.

CVSS severity6.1
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Wrongthink before 2.4.1 allows local users to execute arbitrary JavaScript through crafted fingerprint input. The fingerprint check-in path accepts script markup as a fingerprint and renders it without neutralizing script-related HTML. The user must be able to check a fingerprint into the service; execution occurs in the site's origin and can expose accessible data or alter page actions.

The record

CVE
CVE-2021-29467
Published
Apr 22, 2021
Updated
Aug 3, 2024
Vendor
Birb Digital
Product
Wrongthink
Classifications
CWE-80, CWE-79, T1059.007
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 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=< 2.4.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Birb Digital · Wrongthinkversion=< 2.4.1

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/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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