CVE-2026-78363Network attack vectorHinoki check available

Unauthenticated shortcode execution via reflected merge tags

Published Sep 1, 2026 · Updated Sep 1, 2026

Shortcode injection in MW WP Form before 5.1.5 allows remote attackers to execute registered site shortcodes through form submissions. Completion-message merge processing inserts submitted field values and then passes the resulting message through WordPress shortcode evaluation without neutralizing shortcode delimiters. The form must reflect a submitted value on its completion screen, and resulting impact is limited to capabilities exposed by shortcodes registered on that site.

CVSS severity4.8
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Shortcode injection in MW WP Form before 5.1.5 allows remote attackers to execute registered site shortcodes through form submissions. Completion-message merge processing inserts submitted field values and then passes the resulting message through WordPress shortcode evaluation without neutralizing shortcode delimiters. The form must reflect a submitted value on its completion screen, and resulting impact is limited to capabilities exposed by shortcodes registered on that site.

The record

CVE
CVE-2026-78363
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
株式会社Webの相談所
Product
MW WP Form
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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 <5.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

株式会社Webの相談所 · MW WP Formversion=0 <5.1.5

Published CVSS scores

4.8WPScan CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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