CVE-2026-4431Network attack vector

Unauthenticated post modification via unchecked AJAX handler

Published Aug 5, 2026 · Updated Aug 5, 2026

Missing authorization in ThemeRuby Easy Post Submission 2.3.0 and earlier allows remote attackers to modify arbitrary WordPress posts. The unauthenticated rbsm_submit_post AJAX action passes a supplied postId to create_post() without checking capabilities or ownership. No account or user interaction is required; an attacker can rewrite post fields or set the status to draft, effectively unpublishing content.

CVSS severity9.1
Critical
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ThemeRuby Easy Post Submission 2.3.0 and earlier allows remote attackers to modify arbitrary WordPress posts. The unauthenticated rbsm_submit_post AJAX action passes a supplied postId to create_post() without checking capabilities or ownership. No account or user interaction is required; an attacker can rewrite post fields or set the status to draft, effectively unpublishing content.

The record

CVE
CVE-2026-4431
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
ThemeRuby
Product
Easy Post Submission
Classifications
CWE-862, T1491.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThemeRuby · Easy Post Submissionversion=0 <=2.3.0

Published CVSS scores

9.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1491.002External Defacement

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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