CVE-2022-33201Network attack vector

API key replacement via missing nonce validation

Published Aug 5, 2022 · Updated Apr 28, 2026

Cross-site request forgery in MailerLite – Signup forms (official) 1.5.7 and earlier allows remote attackers to change the API key. Plugin settings-update handlers accept forged requests without validating a WordPress nonce before storing a replacement API key. An administrator must follow an attacker-controlled link or submit a crafted form, after which the stored integration credential is replaced.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in MailerLite – Signup forms (official) 1.5.7 and earlier allows remote attackers to change the API key. Plugin settings-update handlers accept forged requests without validating a WordPress nonce before storing a replacement API key. An administrator must follow an attacker-controlled link or submit a crafted form, after which the stored integration credential is replaced.

The record

CVE
CVE-2022-33201
Published
Aug 5, 2022
Updated
Apr 28, 2026
Vendor
MailerLite
Product
MailerLite – Signup forms (official)
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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=<= 1.5.7 <=1.5.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MailerLite · MailerLite – Signup forms (official)version=<= 1.5.7 <=1.5.7

Published CVSS scores

6.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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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