Security readout for executives and security teams
Plain-English summary
CVE-2026-25420 is a broken access control issue in the WordPress MailerLite plugin, affecting versions through 1.7.18. A logged-in user could reach functionality they should not be authorized to use. The published impact is limited, with availability affected and no stated confidentiality or integrity impact.
Executive priority
Treat as a routine but timely WordPress plugin remediation item. It is not currently supported as actively exploited, but affected internet-facing sites with user accounts should be reviewed promptly to reduce avoidable availability risk.
Technical view
The CVE describes CWE-862 Missing Authorization in MailerLite official-mailerlite-sign-up-forms through version 1.7.18. CVSS 3.1 is 4.3: network-accessible, low complexity, low privileges required, no user interaction, unchanged scope, availability low impact only. Public sources do not provide endpoint-level details or a named fixed version.
Likely exposure
Exposure is limited to WordPress sites running the MailerLite plugin official-mailerlite-sign-up-forms at version 1.7.18 or earlier. Exploitation requires an authenticated low-privilege user account, based on the CVSS privileges-required value.
Exploitation context
The source bundle does not identify active exploitation, public exploit code, or CISA KEV listing. Risk is higher on sites that allow public user registration or have many low-privilege WordPress accounts.
Researcher notes
Public details are sparse. The record states missing authorization and low availability impact only; it does not disclose vulnerable actions, affected endpoints, exploit prerequisites beyond low privileges, or a fixed version. Avoid assuming data theft or unauthenticated exploitation from the available evidence.
Mitigation direction
- Inventory WordPress sites for the MailerLite official-mailerlite-sign-up-forms plugin.
- Identify plugin versions and prioritize any instance at 1.7.18 or earlier.
- Check MailerLite, WordPress.org, and Patchstack guidance for a fixed version or vendor mitigation.
- Restrict unnecessary low-privilege WordPress accounts until remediation is confirmed.
- Review logs for unusual authenticated activity involving the MailerLite plugin.
Validation and detection
- Confirm whether the plugin is installed on each WordPress site.
- Record the installed plugin version from WordPress administration or asset inventory.
- Compare installed versions against the affected range: through 1.7.18.
- Check whether vendor or Patchstack advisories name a fixed release.
- Verify remediation by confirming the plugin is updated, removed, or otherwise vendor-mitigated.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-25420 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.