CVE-2024-1386Network attack vector

Stored script execution via unescaped shortcode attributes

Published May 2, 2024 · Updated Aug 1, 2024

Stored XSS in MailerLite – Signup forms (official) 1.5.0 through 1.7.6 allows remote authenticated users to run scripts via shortcode attributes. InvalidForm.php in the shortcode rendering path places user-supplied attributes into page output without sufficient sanitization or context-appropriate escaping. Contributor-level access is required to store the payload, which executes in a visitor’s browser whenever the injected page is opened.

CVSS severity6.4
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in MailerLite – Signup forms (official) 1.5.0 through 1.7.6 allows remote authenticated users to run scripts via shortcode attributes. InvalidForm.php in the shortcode rendering path places user-supplied attributes into page output without sufficient sanitization or context-appropriate escaping. Contributor-level access is required to store the payload, which executes in a visitor’s browser whenever the injected page is opened.

The record

CVE
CVE-2024-1386
Published
May 2, 2024
Updated
Aug 1, 2024
Vendor
MailerLite
Product
MailerLite – Signup forms (official)
Classifications
T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.0 <=1.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MailerLite · MailerLite – Signup forms (official)version=1.5.0 <=1.7.6

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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

T1059.007JavaScript

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo