CVE-2026-4431: CWE-862 Missing Authorization in themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress
The Easy Post Submission plugin for WordPress contains a critical vulnerability due to missing authorization checks in the create_post() function. This flaw allows unauthenticated attackers to modify arbitrary posts by exploiting the rbsm_submit_post AJAX action. Attackers can change post titles, content, excerpts, categories, tags, and even unpublish posts by setting their status to draft. The vulnerability affects all versions up to and including 2.3.0. No official patch or remediation guidance is currently available.
AI Analysis
Technical Summary
CVE-2026-4431 is a critical authorization bypass vulnerability in the Easy Post Submission plugin for WordPress (versions up to 2.3.0). The vulnerability arises because the AJAX action rbsm_submit_post is registered for unauthenticated users without any capability checks when a postId parameter is provided. This allows unauthenticated attackers to modify various fields of arbitrary posts, including title, content, excerpt, categories, tags, and post status, effectively enabling unauthorized content modification and unpublishing.
Potential Impact
An unauthenticated attacker can modify the content and metadata of any post on a vulnerable WordPress site using this plugin. This includes changing the post title, content, excerpt, categories, tags, and setting the post status to draft, which can unpublish the post. The integrity and availability of site content can be severely impacted, leading to potential content defacement or disruption of published information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict or disable the Easy Post Submission plugin if possible. Monitor for updates from the vendor or plugin repository and apply any official patches promptly once available.
CVE-2026-4431: CWE-862 Missing Authorization in themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress
Description
The Easy Post Submission plugin for WordPress contains a critical vulnerability due to missing authorization checks in the create_post() function. This flaw allows unauthenticated attackers to modify arbitrary posts by exploiting the rbsm_submit_post AJAX action. Attackers can change post titles, content, excerpts, categories, tags, and even unpublish posts by setting their status to draft. The vulnerability affects all versions up to and including 2.3.0. No official patch or remediation guidance is currently available.
CVSS v3.1
Score 9.1critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-4431 is a critical authorization bypass vulnerability in the Easy Post Submission plugin for WordPress (versions up to 2.3.0). The vulnerability arises because the AJAX action rbsm_submit_post is registered for unauthenticated users without any capability checks when a postId parameter is provided. This allows unauthenticated attackers to modify various fields of arbitrary posts, including title, content, excerpt, categories, tags, and post status, effectively enabling unauthorized content modification and unpublishing.
Potential Impact
An unauthenticated attacker can modify the content and metadata of any post on a vulnerable WordPress site using this plugin. This includes changing the post title, content, excerpt, categories, tags, and setting the post status to draft, which can unpublish the post. The integrity and availability of site content can be severely impacted, leading to potential content defacement or disruption of published information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict or disable the Easy Post Submission plugin if possible. Monitor for updates from the vendor or plugin repository and apply any official patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-19T15:28:20.572Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a72f050bf8831d53984b010
Added to database: 08/05/2026, 08:12:00 UTC
Last enriched: 08/05/2026, 08:26:37 UTC
Last updated: 08/05/2026, 09:01:38 UTC
Views: 16
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