CVE-2021-27914Network attack vector

Script execution via unsanitized installer information

Published Jun 1, 2022 · Updated Aug 3, 2024

Cross-site scripting in the Mautic installer before 4.3.0 allows remote authenticated users with installer access to inject JavaScript. The installer logic insufficiently sanitizes submitted installation information before placing it in web output, allowing attacker-controlled script execution in another browser. Administrator access to the installation process and victim interaction are required; public sources identify no narrower field or function.

CVSS severity7.6
High
EPSS probability0.46%
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 the Mautic installer before 4.3.0 allows remote authenticated users with installer access to inject JavaScript. The installer logic insufficiently sanitizes submitted installation information before placing it in web output, allowing attacker-controlled script execution in another browser. Administrator access to the installation process and victim interaction are required; public sources identify no narrower field or function.

The record

CVE
CVE-2021-27914
Published
Jun 1, 2022
Updated
Aug 3, 2024
Vendor
Acquia
Product
Mautic
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 1, 2022CVE 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=unspecified <4.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Acquia · Mauticversion=unspecified <4.3.0

Published CVSS scores

7.6MauticCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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