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CVE-2026-3253— MailerLite – Signup forms (official) <= 1.7.21 - Missing Authorization to Authenticated (Contributor+) Form Creation and Deletion

Quick assessment

Affected
mailerlite MailerLite – Signup forms (official)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 官方插件 MailerLite – Signup forms 中存在数据未被授权修改的漏洞，这是由于 AdminController 类的 forms() 方法缺少权限检查。在 1.7.21 及更早版本中均存在此问题。这使得具有贡献者及以上权限的已认证攻击者能够创建或删除任意的注册表单。

CVSS 4.3 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1098 · Account Manipulation

Affected Version Matrix 1

VendorProduct Version RangeStatus
mailerlite MailerLite – Signup forms (official) ≤ 1.7.21 affected
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I. Basic Information for CVE-2026-3253

Vulnerability Information
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Vulnerability Title
MailerLite – Signup forms (official) <= 1.7.21 - Missing Authorization to Authenticated (Contributor+) Form Creation and Deletion
Source: CVE Program / CVE List V5
Vulnerability Description
The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the forms() method of the AdminController class in all versions up to, and including, 1.7.21. This makes it possible for authenticated attackers, with Contributor-level access and above, to create or delete arbitrary signup forms.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mailerlite MailerLite – Signup forms (official) 0 ~ 1.7.21 -

II. Public POCs for CVE-2026-3253

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III. Intelligence Information for CVE-2026-3253

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Patches & Fixes for CVE-2026-3253 (1)

News Coverage for CVE-2026-3253 (1)

IV. Related Vulnerabilities

Same product: MailerLite – Signup forms (official)
Same vendor: mailerlite
Same weakness: CWE-862

V. Comments for CVE-2026-3253

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