Security readout for executives and security teams
Plain-English summary
CVE-2026-1051 affects the WordPress plugin “Newsletter – Send awesome emails from WordPress” through version 9.1.0. A malicious site or link could cause a logged-in WordPress user to unknowingly unsubscribe newsletter subscribers. This is not a server takeover issue, but it can disrupt marketing operations and subscriber integrity.
Executive priority
Treat as a moderate-priority WordPress plugin issue. It is unlikely to cause full compromise based on provided evidence, but it can undermine email marketing lists and customer communications. Prioritize remediation on public-facing or business-critical WordPress sites using this plugin.
Technical view
The issue is cross-site request forgery caused by missing or incorrect nonce validation in hook_newsletter_action(). An unauthenticated attacker must trick a logged-in user into taking an action, such as clicking a link. The documented impact is unauthorized newsletter unsubscription. CVSS is 4.3, with low integrity impact and required user interaction.
Likely exposure
Exposure is limited to WordPress sites running the Newsletter plugin at versions up to and including 9.1.0. Sites without this plugin, or not using affected versions, are not indicated as exposed by the provided sources.
Exploitation context
The source bundle does not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires social engineering of a logged-in user and results in subscriber unsubscription, not direct code execution or data theft based on available evidence.
Researcher notes
The public description attributes the flaw to hook_newsletter_action() and missing or incorrect nonce validation. Available evidence supports CSRF to subscriber unsubscription only. No exploit-in-the-wild claim, patch version, or broader impact is established in the provided source bundle.
Mitigation direction
- Identify all WordPress sites using the Newsletter plugin.
- Check the installed plugin version against 9.1.0 or earlier.
- Review vendor or WordPress plugin guidance for an available fixed version.
- Update the plugin if a vendor-supported fix is available.
- Limit administrative browsing while logged into WordPress.
Validation and detection
- Confirm the plugin is installed only where business-required.
- Record installed Newsletter plugin versions across WordPress assets.
- Review web logs for unusual newsletter unsubscription activity.
- Verify nonce validation guidance or fixes from the vendor.
- Monitor subscriber count anomalies after remediation.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2026-1051 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:N/UI:R/S:U/C:N/I:L/A:N
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:N/UI:R/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.