Security readout for executives and security teams
Plain-English summary
CVE-2026-4431 lets unauthenticated visitors alter existing WordPress posts on sites using Easy Post Submission up to 2.3.0. Attackers could rewrite content, change categories or tags, or set posts to draft, effectively removing them from public view. This is a high business-risk content integrity and availability issue.
Executive priority
Treat as urgent for any site using this plugin, especially marketing, news, ecommerce, or public-facing sites where content trust matters. Prioritize inventory, update or removal, and content integrity review.
Technical view
The plugin registers rbsm_submit_post for unauthenticated AJAX use and lacks an authorization check in create_post() when postId is supplied. Sources state attackers can modify arbitrary post title, content, excerpt, categories, tags, and status. CVSS is 9.1: network-accessible, low complexity, no privileges, no user interaction, high integrity and availability impact.
Likely exposure
Public WordPress sites running Easy Post Submission versions up to and including 2.3.0 are the likely exposure. The CVE metadata has some version-field inconsistency, so confirm against the plugin version and vendor advisories.
Exploitation context
No active exploitation is stated in the provided sources, and KEV is false. Exploitation requires web access only and no login, making exposed public sites attractive targets for defacement, content manipulation, or unpublishing important posts.
Researcher notes
Evidence points to CWE-862 missing authorization in unauthenticated AJAX handling. The bundled WordPress Trac references identify relevant code locations and a later changeset, but the provided sources do not clearly name a fixed version. Avoid assuming exploit activity without external confirmation.
Mitigation direction
- Check the WordPress plugin repository and vendor guidance for a fixed release.
- Upgrade promptly if a fixed version is available.
- Disable or remove the plugin if no fixed version is confirmed.
- Restore altered posts from known-good backups if content changes are found.
- Monitor for unexpected post edits, drafts, category changes, or tag changes.
Validation and detection
- Inventory WordPress sites for the Easy Post Submission plugin.
- Confirm installed plugin versions, prioritizing versions up to 2.3.0.
- Review recent post revision history for unauthorized changes.
- Check access logs for unauthenticated AJAX activity involving rbsm_submit_post.
- Verify whether vendor changeset 3488045 is included in the installed plugin code.
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-2026-4431 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
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.
SSVC decision data
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:N/S:U/C:N/I:H/A:H3.95.2WordfenceVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineWordfence
Vendor Notified
- Source timelineWordfence
Disclosed
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/15494ccf-7c9d-4566-9e80-2da94172a3dd?source=cveCVE reference, Wordfence
- https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/includes/client-ajax-handler.php#L38CVE reference, Wordfence
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3488045%40easy-post-submission%2Ftrunk&old=3427523%40easy-post-submission%2FtrunkCVE reference, Wordfence
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.