CVE-2021-24301Public exploitNetwork attack vector

Administrator-only stored XSS via unescaped textarea input

Published May 24, 2021 · Updated Aug 3, 2024

Stored XSS in Hotjar Connecticator 1.1.1 and earlier allows remote authenticated users to execute script through the Hotjar script field. A closing textarea sequence is accepted without effective neutralization, persisted in the setting, and rendered into site pages where the injected script runs. Administrator access and a valid CSRF nonce are required, and successful exploitation runs attacker-controlled JavaScript in the browsers of site visitors.

CVSS severity5.4
Medium
EPSS probability0.62%
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 Hotjar Connecticator 1.1.1 and earlier allows remote authenticated users to execute script through the Hotjar script field. A closing textarea sequence is accepted without effective neutralization, persisted in the setting, and rendered into site pages where the injected script runs. Administrator access and a valid CSRF nonce are required, and successful exploitation runs attacker-controlled JavaScript in the browsers of site visitors.

The record

CVE
CVE-2021-24301
Published
May 24, 2021
Updated
Aug 3, 2024
Vendor
Blue Medicine Labs
Product
Hotjar Connecticator
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 24, 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=1.1.1 <=1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Blue Medicine Labs · Hotjar Connecticatorversion=1.1.1 <=1.1.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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